[TowerTalk] waterproofing big #31 clamp-on choke

[Dave Clemons]

I have read Jim Brown's RFI-Ham.pdf (K9YC.com).  In chapter 7 ("K9YC's 
Choke Cookbook") he gives specifications for number of coax turns using 
a big #31 ferrite clamp-on.  I have built one of these, and it will be 
installed at the feed point of a 40m sloper.  Has anyone done this, and 
if so, how did you waterproof the clamp-on?  I would imagine that ice 
will pretty quickly destroy the ferrite clamp-on.  I would prefer not to 
have to use an enclosure due to the added weight it will bring to the 
sloper.  I think that the expandable urethane based spray foam sold in 
hardware stores, and used on RVs as well might be my best bet, but I'd 
like to hear if others have tackled this problem.

Dave K1VUT