Hi, I was looking at the page on this site that was saying the legal frequencies for radios. But when i go to look at radios online for sale most seem to be 40mhz. are 40mhz radios legal? (for flight) Also, are 35mhz legal too (in the USA). sorry, I am new to the forums and to rc flight, i want to get my sh!t straight before i go out and buy stuff. Thanks.