As in the flights or the hardware?
I've always thought drones would work well as ambush devices i.e. don't make a long flight to a target but stash within a few seconds of flight time.
If it's the hardware then is there not much of a DIY scene anymore? I assumed the tech was mostly in the components e.g. cameras/motors/batteries rather than the integration. I'm not a drone person but when I cast my eye at FPV racing drones, it seemed they were building their own with off-the-shelf components.
> radio links
I see Russia heavily using fibre-optic drones these days and they blew my mind. When I heard of "wire-guided missile" I assumed it was some term-of-art and never conceived they literally laid down wire. I understand you can buy kilometre spools of the stuff for a few bucks so I guess it's in consumer's reach.
Ah, I've just realised the "Ariadne's thread" weakness of using fibre-optic for something covert! Maybe the launch site can hop to another connection though...