[TowerTalk] Antenna problem?

[K7LXC@aol.com]

Howdy, TowerTalkians --

    I've got an antenna problem and I'm stumped. An M2 15M monobander 
developed some high swr - 3:1 or more where it used to be 1.1:1.

    I took a crane and man-basket up to the feedpoint and measured the swr 
with my MFJ at the balun; it was 1.2:1. I next measured at the jumper to the 
tower - same thing. Then I measured the end of the feedline in the shack - same 
thing. As far as I was concerned, the antenna system was fine.

    Plug it into the FT-990 and the swr on the rig was 3:1. Antenna tuner was 
off. Add different lengths of RG-8, the swr varied from 2.5:1 to 5:1.  It 
doesn't seem to be wx related.  

    Like I said, I'm stumped. Any help out there? Solutions appreciated!

Cheers,
Steve    K7LXC
TOWER TECH