What is used on monopole towers to guide the cable in and out of the tower?

• A. Waveguide
• B. Monopole Mount
• C. T-Boom
• D. Port Hole

Answer: (D)

On monopole towers, there’s a dedicated entry point for the feeder cables called a port hole. It provides a guided, protected path for coax or other cables as they enter and exit the tower, keeping the line aligned and away from sharp edges or the weather, which helps prevent damage and makes installation or servicing easier. The port hole also helps seal out moisture to protect the connections inside.

Other concepts don’t serve this purpose: a waveguide is a conduit used for certain microwave frequencies, not the standard tower feeder routing; a monopole mount is simply the hardware that holds the antenna itself; a T-Boom is a support framework for antennas or equipment. So the port hole is the feature specifically used to guide the cable in and out of the tower.