finally got 4 hawks xr patch antenna in 6-24-20. did a 8 test flights with just the xr connected to the st16s. best results seem to be with the h520 100 feet in front of the controller. when at over 300 ft agl. where I was at it will work good control link rssi was hitting 72 to 75 at 900 ft to 1000 ft at 392 ft agl. there was issues with the 5.8 camera video link when aircraft was about over and beyond power lines that where 1100ft to 1200ft out (not the high voltage types) the normal pole runs that follow the roads. at 3800 ft the camera dropped out. the screen went from e90 to no camera and the rtl kicked in. Did that with both e90 and c23. that's with the antenna pointed right at the aircraft when standing. however when I pointed the controller more to the ground much to my surprise there was no video lag issue same path got to bit over 5000ft no lag and rtl did not kick in and camera did not dropout. did a run with only the 4 hawks sr version pointed right at the h520 I got almost same results with video lag and doing the same flight path with the xr version attached. however in the past when I had both 4hawks sr and yuneec oem antenna connected to the st16s with a rp sma splitter I was able to fly out 5290ft out no video lag no rtl. flew with just oem yuneec antennas same path no video lag when crossing over the power lines got to 2600 ft before video started to lag and return with out rtl kicking in and the camera did not dropout. the 5.8ghz video link was having the main issues. Did another set or of flights over a path that gave my yuneec oem antenna fits with rtl kicking in much shorter distances, that path had me flying from ohio into michigan no video lag but control link dropouts. With the 4hawks xr got bit 4000ft out when I got video lag and camera dropout then rtl kicked in when the controller pointed right at the h520. did not get back to angle mode untill I was back in ohio. the ohio line is 500 ft from where I was at. I was at 395 agl at the time. near same results with the 4 hawks sr version with video lag the camera did not dropout though. rtl did kickin for short time though. last run with the 4hawks xr into michigan bit over 4000ft this time controller more pointed to the ground than right at the h520 got to 4200 ft out no video lag no camera dropout and for the very first time with this path no rtl kick in. I have a 5.8 ghz booster being shipped in and I do have a ham radio license. going to see if that will help with video lag issues when pointing the controller right at the h520.