A Basic Exchange Telecommunications Radio System (BETRS) is "[a]n FCC classification for digital microwave radio systems." It is in the 152–159 MHz, 454–460 MHz, 816–820 MHz, and 861–865 MHz spectrum bands. BETRS spectrum is used to provide basic, digital, telephone service to subscribers in locations deemed so remote that traditional wireline service or service by other means is not feasible.
BETRS dates back to 1988 when the FCC established service rules for BETRS. BETRS augments the existing Rural Radiotelephone Service by using digital technologies with enhanced capabilities. There are 94 channels available for BETRS. Each channel is 20 kHz.