Gamma matches work well. One method (and there are many) for waterproofing
that I like is to wrap the connection, or open end, with 3M electrical tape
making sure to overlap your winding and pull it tight as you go. Then
spray the tape down with a clear over-coat enamel or Krylon - this seals
the edge of the tape. Let it dry a few minutes and give it a second
wrapping of electrical tape. I do this with all of my outside connections
and it works great - the advantage is that your can cut the tape with a
knife for rework (unlike the waterproofing gunk (that also works well)).
It should have minimal or no interaction with the gamma match.
73, Jon
W0ZQ
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