I use coax seal --- URL;
http://www.radioworks.com/ccoaxseal.html

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wrote in message
ups.com...
I just installed a dipole antenna using Belden coax 9913-F with pl-259
to so-234(?) connectors. I read online the mention of coax seal to
keep water out. Is this necessary? Is there a common substance around
the house that may work? Thank you.