I don't know about the regulations in TV but if I had a choice I would have nothing but a metal roof. In fact, the one on my current home was installed in 1861 (that's right, the year the civil war began).
The newer metal roofs, which I have installed on my outbuildings (garage etc.) have the color already in the metal. We installed metal roofing on my mother's house 20 years ago and it is still like the day it was installed.
As far as cell phone service, it has never been a problem. And, I love the sound when it rains.
Just my 2 cents. Hope this helps.
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