Well, technically, you do if you plan to legally operate the VTX since it's within a ham radio range. Many dont bother with the license but you are supposed to have at least a technician license. If you dont build or buy the bind and fly drones you might not run into this.
Interesting to read up on this again.
People who fly drones with FPV drones may need to obtain an amateur radio license in order to legally use an on-board video system during flights.
hamradioprep.com
I learned more from this site above I found than a previous curious search a few years ago, when I found most fpv systems as standard units are fine without any ham radio license requirements.
I guess the really long range cinematic type vtx systems are possibly found in over 1w (the legal requirement for such a license).
Edit, apologies, up to 25mW in most countries, so technically yes in the US to fly anything more powerful you need the basic licence.
Other countries should check for local requirements.
But in general 5.8Ghz 200mW VTX should handle 2Km-3Km range easily with a correct setup . . . from . . .
Explore our comprehensive guide on video transmitter for FPV drones, covering the best VTX recommendations and key factors like power, channels and settings to enhance flying experience.
oscarliang.com
Noted this tutorial also states over 600mW is best for solo long range fpv (can’t fly near others with this power), which of course is bvlos and technically illegal in almost all countries and regions.
I could only easily find very sub 1w units online, didn’t specifically try and find 1w vtx setups though.
An interesting topic and it was good to find out more about this.