Review on 🔌 2-Pack Matching Transformer, Ancable Nickel Plated - 75 Ohm to 300 Ohm Adapter - UHF/VHF/FM Balun Transformer - Antenne Converter Adapters with F Female Jack for TV, Radio, Coax Antenna by Sean Young

They were intended for use on the roof. They are not waterproof. The F connector moves slightly, putting stress on the tiny wires in the ferrite transformer. In wind and rain, the device is soon out of order. The outer plastic shrink wrap was removed with a knife and I checked the inside. See photo. The end of the F-connector is protected against twisting by a plastic housing, but it is not tightened enough. The end of the double line is not completely sealed. I used epoxy to glue both ends and clamp them in place. This sealed the double line and F-connectors. I used a vinyl electric tap to wrap the case and connect the RG6 jumper wire. This will work for a while. Three stars if you only want to use this indoors with bunny ears and the end of the RG6 cable doesn't move.