The engine compartment is going to be too hot, and the trunk is basically a metal box, so you can still pretty much rule those out. It's not clear why the engi

The engine compartment is going to be too hot, and the trunk is basically a metal box, so you can still pretty much rule those out. It's not clear why the engine compartment would be too hot. Most automobiles have a slew of electronics stashed under the hood, and they work just fine, across a huge temperature range. Also not clear why the trunk is ruled out, for a system that is "spliced right into your car's electrical system." Many cars have the actual radio stuck in the trunk, and they work just fine, since the electrical system includes an antenna.