My wife's new Honda Jazz came with a great long whip aerial that would hang up on the garage door when you pull out. I replaced it with a much shorter one from Autozone this morning. Radio reception does not seem to be affected.
Also, there is no water temperature gauge. When the car is cold, you get a blue warning light. It goes away once the engine warms up, usually a block or two from home. I suppose there is a red light for when it gets too hot, but I will have to read the manual to confirm that.
Let's just say years of BMW ownership has made both of us hyper sensitive to little warning lights telling you things about the cooling system, hehehe.