It won't give you clear calls when there wasn't service before but it will receive and send text when there wasn't service before and if the signal is weak but there it will boost it a bit

double sided taped it to the top of my truck, spent a good bit of time tucking my wires in behind weather

It's a little bit of trial and error, but worth it for an extra bar or two

It's a little bit annoying as my cat likes to jump around and my phone will slide off the antenna