Best sealant for side of fifth wheel
So we picked up our brand new fifth wheel last month, and though I don't think my wife is happy about it I already plan on poking holes in it :) I am going to mount a cell booster antenna on the si...
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Barney's marine through hole fitting is the best, allows a user to vacate the wire in the future and provides good sealing. If the OP just wishes to drill a hole in the siding, Geocel sealants are the best, IMO. I use Tripolymer 2300 which is almost the same recipe as Proflex RV but has better elongation and strength. The 2300 is available through my local roofing distributor for less than $10/tube.
Another way to accomplish the through-wall access is to use a plate and mount coax fittings on the plate. Seal the plate to the exterior of the RV. I did this for TV and radio antenna leads and used 1/8" polycarbonate. I did have to attach my antenna wiring inside the wall to the exterior coax fittings but I have permanent antenna runs that are now accessed by interior wall plates.
Picture of plate:
Another way to accomplish the through-wall access is to use a plate and mount coax fittings on the plate. Seal the plate to the exterior of the RV. I did this for TV and radio antenna leads and used 1/8" polycarbonate. I did have to attach my antenna wiring inside the wall to the exterior coax fittings but I have permanent antenna runs that are now accessed by interior wall plates.
Picture of plate:
