Radu, By wireless phone, I m not sure if you re specifically talking about cordless phones as used in the home, or cellular phones. Cordless phones don tMessage 1 of 1 , Nov 13, 2001View Source
By "wireless phone," I'm not sure if you're specifically talking about "cordless phones" as used in the home, or cellular phones. Cordless phones don't have the range you're looking for. They are built for mass use and operate in the same narrow range of frequencies. I lived in an apartment complex with dozens of people using these things. So that many people may have the same type of phone and not interfere with each other, they have a very limited range, maybe tens of meters. Five kilometers is WAY out of range for these phones.
Other than cordless phones, I would suggest two-way radios, "walkie talkies," CB radio, or cellular phones. Ham radio could be another way to go. Either of these options would allow the range you want. Except for the cellular phone, the others allow for EASY eavesdropping, interference and being "stepped on" by someone on the same frequency.
Does anyone else have anything to add...or correct me on?
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