49 MHz is a radio carrier frequency used for the operation of toy radio controlled models. The term "MHz" refers to "megahertz," or one million cycles per second. Though 49 MHz radios are generally installed in surface models, they can be used in toy aircraft as well since the 49 MHz frequency range is considered to be part of the citizen's band, at least in the US. This article is a stub. You can help by [ adding to it].