The frequency range of the RF-10 is 44.000-53.975MHz. The frequency allocation of the 6 meter amature radio band is 50.000-54.000 MHz, so you do not necessarily need two of the RF-10's to communicate, however to utilize the entire frequency range you would need two. Range up to 3 miles depending on terrain and other conditions. I do not recommend operating in those frequencies without an amature radio license.