[backwoods-engineer]

I’m an RF engineer, and I’ve used spray-on RF shielding. If the resistance of the material is low enough, I don’t see why there couldn’t be a spray-on antenna. You don’t even have to connect to it directly; you could capacitively couple to it from the circuit board itself.

[BenLurkin]

Is a spray-on “faraday cage” possible?

[bigbob]

Also see: https://www.cnet.com/news/spray-on-antenna-wireless-in-a-can/