iwlist-scan.output

"Bad" unprotected network:
          Cell 07 - Address: 7C:95:F3:CC:3D:F1
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=55/70  Signal level=-55 dBm  
                    Encryption key:off
                    ESSID:"UR_MCguest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=0000015e726f8e35
                    Extra: Last beacon: 32ms ago
                    IE: Unknown: 000A55525F4D436775657374
                    IE: Unknown: 01061824B048606C
                    IE: Unknown: 030101
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 200103
                    IE: Unknown: 2A0100
                    IE: Unknown: 460573C0000000
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 851E00008F00FF00FF03590048482D504F422D41312D312D3130340007000040
                    IE: Unknown: 9606004096000700
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD050040961408
                    IE: Unknown: DD1D0040960C032F0E2BB6D522540100000000000000000000000000000000
...
          Cell 09 - Address: 5C:A4:8A:92:E5:A1
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=55/70  Signal level=-55 dBm  
                    Encryption key:off
                    ESSID:"UR_MCguest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=0000015e724f6164
                    Extra: Last beacon: 32ms ago
                    IE: Unknown: 000A55525F4D436775657374
                    IE: Unknown: 01061824B048606C
                    IE: Unknown: 03010B
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 200103
                    IE: Unknown: 2A0100
                    IE: Unknown: 460573C0000000
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 851E04008F00FF00FF03590048482D504F422D41312D312D3130310005000040
                    IE: Unknown: 9606004096000700
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD050040961408
                    IE: Unknown: DD1D0040960C032F0E1ABFD522540100000000000000000000000000000000
....
          Cell 14 - Address: C0:7B:BC:23:97:E1
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=45/70  Signal level=-65 dBm  
                    Encryption key:off
                    ESSID:"UR_MCguest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=0000015e7244ebab
                    Extra: Last beacon: 32ms ago
                    IE: Unknown: 000A55525F4D436775657374
                    IE: Unknown: 01061824B048606C
                    IE: Unknown: 030101
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 200103
                    IE: Unknown: 2A0100
                    IE: Unknown: 460573C0000000
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 851E05008F00FF00FF03590048482D504F422D41312D312D3130330004000040
                    IE: Unknown: 9606004096000700
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD050040961408
                    IE: Unknown: DD1D0040960C032F0E55C2D522540100000000000000000000000000000000
          Cell 15 - Address: 50:1C:BF:D6:EB:B1
                    Channel:6
                    Frequency:2.437 GHz (Channel 6)
                    Quality=47/70  Signal level=-63 dBm  
                    Encryption key:off
                    ESSID:"UR_MCguest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=0000015e722a18bd
                    Extra: Last beacon: 32ms ago
                    IE: Unknown: 000A55525F4D436775657374
                    IE: Unknown: 01061824B048606C
                    IE: Unknown: 030106
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 200103
                    IE: Unknown: 2A0100
                    IE: Unknown: 460573C0000000
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 851E03008F00FF00FF03590048482D504F422D41312D312D3130330000000040
                    IE: Unknown: 9606004096000700
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD050040961408
                    IE: Unknown: DD1D0040960C032F0EF9C7D522540100000000000000000000000000000000
......
          Cell 19 - Address: 58:0A:20:0C:07:B1
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=36/70  Signal level=-74 dBm  
                    Encryption key:off
                    ESSID:"UR_MCguest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=0000015e72677a1a
                    Extra: Last beacon: 32ms ago
                    IE: Unknown: 000A55525F4D436775657374
                    IE: Unknown: 01061824B048606C
                    IE: Unknown: 03010B
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 200103
                    IE: Unknown: 2A0100
                    IE: Unknown: 460573C0000000
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 851E01008F00FF00FF03590048482D504F422D41312D312D3130350000000040
                    IE: Unknown: 9606004096000700
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD050040961408
                    IE: Unknown: DD1D0040960C032F0EAEB8D522540100000000000000000000000000000000
...
          Cell 22 - Address: 50:1C:BF:F8:8C:61
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=35/70  Signal level=-75 dBm  
                    Encryption key:off
                    ESSID:"UR_MCguest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=0000015e703ee4db
                    Extra: Last beacon: 9456ms ago
                    IE: Unknown: 000A55525F4D436775657374
                    IE: Unknown: 01061824B048606C
                    IE: Unknown: 030101
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 200103
                    IE: Unknown: 2A0100
                    IE: Unknown: 460573C0000000
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 851E01008F00FF00FF03590048482D504F422D41312D312D3130330003000040
                    IE: Unknown: 9606004096000700
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD050040961408
                    IE: Unknown: DD1D0040960C032F0EA1B2D522540100000000000000000000000000000000
Another example of "bad" network:
          Cell 05 - Address: 00:1D:46:25:B9:E2
                    Channel:6
                    Frequency:2.437 GHz (Channel 6)
                    Quality=34/70  Signal level=-76 dBm  
                    Encryption key:off
                    ESSID:"UR_RC_Guest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=000000196e307c81
                    Extra: Last beacon: 36ms ago
                    IE: Unknown: 000B55525F52435F4775657374
                    IE: Unknown: 010698243048606C
                    IE: Unknown: 030106
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 2A0100
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 9606004096001400
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD080040961301003401
                    IE: Unknown: DD050040961404
...
          Cell 09 - Address: 00:1B:2B:69:9C:92
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=47/70  Signal level=-63 dBm  
                    Encryption key:off
                    ESSID:"UR_RC_Guest"
                    Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                              54 Mb/s
                    Mode:Master
                    Extra:tsf=000000196d350c23
                    Extra: Last beacon: 36ms ago
                    IE: Unknown: 000B55525F52435F4775657374
                    IE: Unknown: 010698243048606C
                    IE: Unknown: 03010B
                    IE: Unknown: 0706555320010B1E
                    IE: Unknown: 2A0100
                    IE: Unknown: 7F06001000000040
                    IE: Unknown: 9606004096001400
                    IE: Unknown: DD06004096010104
                    IE: Unknown: DD050040960305
                    IE: Unknown: DD050040960B09
                    IE: Unknown: DD080040961301003401
                    IE: Unknown: DD050040961404

An example of "good" network:
          Cell 03 - Address: 00:24:A8:BE:58:60
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=41/70  Signal level=-69 dBm  
                    Encryption key:off
                    ESSID:"Elmwood"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=00000008c6cfe90e
                    Extra: Last beacon: 36ms ago
                    IE: Unknown: 0007456C6D776F6F64
                    IE: Unknown: 010882848B960C121824
                    IE: Unknown: 030101
                    IE: Unknown: 0706555320010B1B
                    IE: Unknown: 2A0100
                    IE: Unknown: 32043048606C
                    IE: Unknown: 470104
...
          Cell 11 - Address: 64:31:50:DD:4F:20
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=62/70  Signal level=-48 dBm  
                    Encryption key:off
                    ESSID:"Elmwood"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=00000008b64f5922
                    Extra: Last beacon: 36ms ago
                    IE: Unknown: 0007456C6D776F6F64
                    IE: Unknown: 010882848B960C121824
                    IE: Unknown: 03010B
                    IE: Unknown: 0706555320010B1B
                    IE: Unknown: 2A0100
                    IE: Unknown: 32043048606C
                    IE: Unknown: 470104
...
          Cell 15 - Address: 64:31:50:DD:5F:60
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=59/70  Signal level=-51 dBm  
                    Encryption key:off
                    ESSID:"Elmwood"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=000000085e821f33
                    Extra: Last beacon: 36ms ago
                    IE: Unknown: 0007456C6D776F6F64
                    IE: Unknown: 010882848B960C121824
                    IE: Unknown: 03010B
                    IE: Unknown: 0706555320010B1B
                    IE: Unknown: 2A0100
                    IE: Unknown: 32043048606C
                    IE: Unknown: 470104