Noticed my swr on 10m slowly climbing out of no where the other day..Running an ft 857d at 100w never did get an swr alarm from the radio but decided to put an external meter on and it was around 4:1 not good. Checked all the fittings, checked the coax, nothing made sure I still had a good ground (it's a through hole roof mount) that was good...I'm thinking maybe water and a coil failure..any thoughts? Tried cleaning it out and no dice.