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They have wall plates that use a coax connector - inside would be fairly easy , use an electrical box - $2( for plug and switch outlets ) with the coax faceplate -$5 , a coax cable - $5, to an outside waterproof box -$15 ( cut a hole in the trailer side) and another coax faceplate. It works good - i did that to move my tv across the living room w/o all those cables on the floor- buried the cable in the wall and brot it out where i wanted it - nice thing is all you see if you unhooked it is a coax plate, no wires.
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