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 Justin Herman

I bought it for experiments, so I'm not giving a "bad" review, but describing what I found for other potential buyers. The outer "shell" is just a thin piece of shrink-wrapped plastic. Inside is a two-component plastic shell that is easy to disassemble. So I wouldn't use it outside as is, it doesn't look very weatherproof. However, they are perfect for my experiment, rewinding the toroid for different impedances, and when I want to use it outside with a custom antenna, it's repackaged and covered in silicone.