I have a need to provide a communication system for a company building water pipe lines. The pipes are typically 1.2 meters in diameter, and follow the terrain of the land. There are men working inside the pipe (up to 2km up the pipe) who need radio comms to the end. Any suggestions would help. I thought maybe using the pipe as a wave guide for 150 Mhz, but have no idea if this would work.
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