I'm a ham radio operator, but haven't been very active on HF bands for a while. I have an inverted-V antenna and a long run (approximately 25m) of coax that runs from my upstairs "shack" down the wall, through a conduit that I buried in a trench and up near a tall oak tree in which the antenna is mounted.
Other stations don't seem to be able to hear me very well, and so I am suspecting that the coaxial cable may be waterlogged. Other than the obvious tests with an ohm-meter, how can I test the coax to see if it is still OK?
I don't have an antenna analyzer, but do have an antenna tuner and a dummy load.