Ancable Matching Transformer, 3-Pack Gold Plated - 75 Ohm to 300 Ohm Adapter - UHF/VHF/FM Balun Antenne Transformer Converter Adapters with F Female Jack for TV, Radio, Coax Antenna

They seem to work. I used one of them on a DIY TV antenna that I made from a discarded/broken drum head. I used the counter hoop as my antenna.

After playing around with a paper clip to confirm that we can receive some decent ota signals for some channels - those in the uhf range, I decided to try some dipoles and bow ties using old wire coat hangers to pull in abc and cbs which are in the high vhf range. So I needed these to connect the antenna to the tv via coax f- connectors. It ended up working ok, although the antennas being indoors were a bit fussy about positioning in order to get all. So I decided to try to use the cable system put in during house construction. Since we have a new house, we have coax going to each room and the outside, all cables meet up in a wiring cabinet along with the ethernet cables but none were labeled. So I went to each coax with a jumper to short one end and test for continuity at the other end. Once I identified each, I installed an f- connector on the outside cable, used one of these baluns to connect to a bow tie I made out of copper ground wire, and tie wrapped it onto the nearby incoming gas line. Bingo! It works way better than expected. Simply hanging outside, it gets all local stations clear as a bell in crisp HD. So now we can drop live TV from or streaming service and save a bundle. Fwiw, all major channel antennas are only about 20 mi away, all in the same direction except for PBS which is in the uhf range and comes just fine regardless of the antenna used. I actually tried out some fancier designs developed to improve signal gain but none worked indoors all that well. Putting this simple antenna outside has exceed all my expectations.

Good value and fast delivery. Could not find a better buy locally.

Work great

All three worked well when connected to "field-expedient" TV antennas. They were also easy to disassemble/reassemble/modify. They are durable enough, but obviously not water proof or abuse proof. To tear them down, slice the heat shrink wrapping with an X-Acto knife, peel it off, and separate the two-piece plastic enclosure. To reassemble, use cable ties, metal tape, and/or duct tape to secure the enclosure.

Works great

These were for roof top use. They are not waterproof. The F connector moves slightly stressing the tiny wires in the ferrite transformer. So with wind and rain the unit would soon fail.The outer plastic 'shrink wrap' was removed with a knife and I checked inside. See photo. The F connector end is prevented from turning by the plastic housing but it is not tight enough. The twin lead end is not completely sealed.I used epoxy to glue both ends and clamped it shut. This sealed the twin lead and F ends. I used vinyl electrical tap to wrap up the body and onto the connecting RG6 cable. It will work for a while.Three stars if one only wants to use this inside with rabbit ears and the RG6 cable end won't move around.

Shipped fast, great quality, worked out great.