I flew 6.5km w/ no OSD long ago.
plane. (this plane cruises at 3amps and about 30 mph when setup right). I could go MUCH further - it also can thermal and glide very far. You can clearly see where I could have done a lot to clean up the airflow but this is how she looks hanging on the wall. Just ready to charge a pack and give her a go. LOL. It's retired but it was a blast learning on this plane.
ImmersionRC 2.4gHz 500mw vTx
Cercom Technology 8dBi patch with integrated vrx. :
My personal best with OSD is 35.4 km. I have no desire to fly that far again, nor do I have a desire for long range as my FPV needs have changed a lot since I first started. DAVID22 is the long-range no OSD king - I don't think anyone else has come that close. But - as he says, it's pretty easy... it requires is knowing your plane - and knowing the environment. You need to be a weather expert, and you need to do lots of testing using only throttle position and a stopwatch (minutes before LVC).