I'm a firm believer in the Windsurfer. I use the copper variety. As I said earlier, I've made it out 15,000 feet without any loss of signal strength. Now there are some out there that are pieces of crap and give the good ones a bad name, but you can't go wrong by going to Amazon and searching "Windsurfer antenna Phantom 4". Best $20.00 you'll spend. I recommended them to another member over a month ago and he was very pleased with the results he got.