Chris Voute describes that in his EMP weapons series

You should try, for science!

Unfortunately due to the inverse square law, they don't have a very long range.

Possibly for the better. Last thing you need is people accidentally hitting a plane with one of them.

People already do it with lasers. Something that destroys the electronics would be even worse.

would it not be enabled by putting it on the end of a long stick?

I posted one above, however given the height of many of these installations, I think the common piezo+coil demo mounted on either a telescopic floodlight bulb changing pole or a payload drone modified to shield the controller board (otherwise plan to replace the boards) would be simpler safer and cheaper.

Edit: actually since it’s a drone you can just suspend the coil by a string and rely on inverse square for shielding. Much lighter. Cheaper drone or stronger pulse.

Because you need a fuckton of energy to produce an EMP capable of damaging anything. Unless you have access to military grade warheads or a low yield nuclear device, you can forget about it.