<< Mentor Note -- post separated out of a different thread to deal with a separate question >> Hi, I am looking transmit as well as receive power within close proximity. Currently I am looking at 27.255 MHz AM in the citizens band. It is listed on Wikipedia and in statues I found to be for radio controlled devices, as in not to be used for communication. The particular channel has a max power of 25 watt. The current setup I want to have the emitter and receiver approximately 3m apart. I have done a rough calculation of the per square meter flux by representing it as a sphere of 3m radius. I have yet to look into the optimal type of antenna for sending/receiving but approximated the receiving as a disc of 10cm diameter. It looks like resonant antenna of 5.5m length is important here. (wavelength = 11m) This calculated power available is well above the power I want for charging my devices battery. I am interested in any information I can get on antenna configurations, as well as any information on any interference that could come about from this set up. The transmitter I understand will be a crystal oscillator tuned to 27.255 MHz put through some type of amplifier to boost its power.