That's a great idea. Explode the ice out of the coils!
Just a guess, but I'll bet that generating Zapping power at 915 mHz is not something that the typical DIYer would even think about.
Funny, I was just thinking about the ice problem the other day.
How to apply heat real fast and efficient.?. Answer, RF!
I immediately started thinking about the fancy soldering iron on my desk at work. It uses RF power (coax cable to the tip) and it warms up almost instantly. It's the best soldering iron I've ever used..
It never entered my mind to light off the whole outdoor coil with RF..
HAHA! I can just picture that thing getting turned on in the summer
and working as a giant Bug Zapper..