Now the digits are having to learn about the black world of RF. go to the the web site www.arrl.org and brouse through the many books on RF including the do a search on RFI and some articles come up regarding FCC regulations and current interference laws. One comment, doing wireless communications will not be as easy as many think. Just dust off that old CB radio (if you have one) and just listen in. There is so much interference going on you cannot understand anyone. If you have access to a spectrum analyzer that you can connect an antenna to you will be able to see all the RF signals being transmitted in the band of interest. Maybe now the schools will start to teach RF engineering again.