I am thinking of installing my Wi-Fi router in a waterproof box behind my camper rather than running coax inside. Will the signal stay strong as it passes through a plastic box and the aluminum trail...
That's a good approach. Get a waterproof router/AP, Pepwave etc. Are you hardwiring from a broadband connection of some sort, repeating wifi, using 4G as wan or what?
My laptop says my Pepwave AP out back is putting -46dBm through the aluminum roof and sides of my MH when it's set on high power. It would be better if the receiver wasn't inside an aluminum box but the signal certainly isn't blocked.
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