Looking to put a new roof on my parents house in SD. It currently has original 30 year old asphalt shingles that are about falling apart. The roof isn't very steep but it's large and the detached garage is big too. They are considering going with a metal roof for longevity and ease of install. I'm worried about what if does to cell reception and if a cell booster is enough to get that back? Also the house is fairly high end and I'm wondering if the steel roof would lower the value or make it look cheap to some?