Wilson Omni Antennae.
Called Wilson first. They answered all my questions. Took down my Yagi ?Antennae. Attached their Omni antennae, just barley over my tin roof, I live in a little valley almost on top of a mountain. Used my cheap out of business cell phone amplifier I bought on Amazon, mistake. Got off the roof and doubled my bars and haven't dropped a call yet and have had some 45 minutes calls. I should have raised it higher but it works great. Hard to locate cell towers so Omni Ant. did the job. Very happy.