I purchased a Yagi 5.8MHz signal booster from an individual in the US that 3D prints them and sells them on eBay, item 153961889781. The quality is very good. I live in a rural area with mountains and ridges surrounding me. The maximum distance from my house that I could get with the MM was 3460 Ft over the one ridge before the signal began to flutter and I would lose video signal. With the Yagi booster, I flew 4634 Ft yesterday with no signal lose and returned back just because I started to get some wind alarms and decided to wait to another day to test it out further. I am impressed with the additional distance and strong video signal.