http://en.wikipedia.org/wiki/Radio

http://www.radiocommunication.com/

http://www.answers.com/topic/radio

http://www.itu.int/ITU-R/

http://www.ehow.com/how_5542123_radio-communication-guidelines.html

http://www.arcmics.com/

http://newyork.citysearch.com/profile/7289184/congers_ny/goosetown_communications.html

http://www.radioshack.com/category/index.jsp?categoryId=2032052

http://en.wikipedia.org/wiki/Radio_communications_during_the_September_11_attacks

http://www.mcsradio.com/