@merni hey, i have used a few of varying quality, go for 5ghz and your best source these days is a drone specialist. A lot of the drone gear is long range and modular, you can pick and choose feature, cameras transmitters to get the setup you need.The all in one wireless spy camera things you will find on eBay are not so good and subject to a lot of interference. Stay away from 2.4 GHz if you can. I went through a lot of these on a long running show and it was a pain. The static and interference was very welcome in this shows aesthetic so i got away with it. If you need a clean image these will not help you much.Fred