I installed them on the antenna mounted preamp. It will be a year before I can say they actually work, but they definitely look like they're weatherproof. They fit well and take up all the space between the preamp and the jack. Note that they do not seal the end of the cable entry or around the flare nut. .You must use cords with properly installed weatherproof plugs. Plugs without an F seal the inside of the plug well. Hence the need for these boots.
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