[orbital-decay]

So... instead of a live pigeon blocking your signal, you now have a dead one doing the same.

[thysultan]

sprinkling a few dead pigeons around the feet of the device as a warning to would-be trespasser is the darwinian end-game in all of this.

[Akronymus]

Until you get pigeons that are electrocution resistant.

[ficklepickle]

Pigeons are really sensitive to infrasound. It causes them to take flight immediately.

I built a device that created a ~1cm arc to scare away pigeons. You don't need to electrocute them, the sound alone does the job. I don't believe they can develop a tolerance as it is a survival instinct from living in cliff faces.