At my first station, we had what looked like a cast aluminum tire pump, the kind that has two lugs at its base for you to stand on. It had a rectangular glass-windowed compartment on the side that contained dessiccant.
Our transmitter was on a shelf in the back of the control room, so that’s where we kept it.
It’s possible that someone might actually have used it as a tire pump.
How tall was the tower?
Makes a difference.
The temperature difference at the top of the tower vs the temp at the bottom cause condensation. Usually in the connectors and with that corrosion. Have seen if also with wave guide type transmission line. Very expensive transmission line. I have never seen a dry air filled transmission line without a problem internally with corrosion and precipitation of water. I am not a believer in that method.
This is not as much a problem with coax, but is a problem with Heliax and waveguide.