[TowerTalk] Strange SWR/AttenuationpProblems, goes away when the sun comes up

[W1YW at aol.com]

Uh oh, there's water/moisture afoot. Not a temp issue. Most likely  
happening at the connector interface(s) or at the matching system at the antenna  
feedpoint. Could be the traps, but they'd have to be pretty badly corroded  
inside to be that sensitive.
 

I know this is really frustrating and wish you luck. Let us know when you  
get the fix / ID problem.
 

73,
Chip W1YW