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hi. im looking into buying/making a wireless video camera to attach to a radio controlled submarine. im familiar with the 2.4g cctv type spycams and digital video receivers but am told water is an insulator to the fm signal being transmitted. im also aware of the rc 12 wireless mini cam which transmits a 1.2g signal "morse code" signal. the range of the rc 12 is less than im looking for of 200 yards at depths of 20 feet. can this be improved on and what are the principles of transmitting underwater. many thanks