How do they do this ?

[Droning on and on...]

As stated above (as long as you posses a ham License) You can turn your Drones transmission WAY up.Many do this license or not but with the threat of FCC prosecution I didnt mind taking the test.

Much easier test than 107, too

 

[ericole]

You can't really compare the possible achievable signal strength between an ordinary DJI Mavic & a FPV Acro quad.

In the FPV Acro quad segment you can chose between many receivers & transmitters... all with a possibility to crank up the transmission power to levels much, much higher than for a DJI Mavic & you can also use ground based relay stations to enhance the connection further.

well, this kind of answer "how" they do it. I wasn't comparing anything, just knew that you can transmit through a lot of solid objects from a normal transmitter and expect such a solid signal. thanks