OK, the Raspberry Pi, plus a biquad dish antenna with an 8 mile range. Adapt to ham radio use, and suddenly you have primary or backup broadband digital back haul, control and / or link capabilities to a remote node or repeater.
How to Build Several Easy Antennas for Amateur Radio. Amateur Radio has been a supreme way of communications for many ways of getting messages from one place to another for decades! Many antennas have been invented simply by necessity.