I'm on the outskirts of a 4G area and can get a decent signal when it's cloudy or at night, probably due to cloud reflection and denser, cooler night air. I also notice that the orientation of the phone changes the signal too. I tether, so a 4G signal helps a lot. I found an exploded view of the TB on a VZW forum which shows the 4g antenna is above the camera on the inside of the battery cover. I noticed there are 2 tiny holes that lead to the antenna from the outside of the cover. HTC put those there by design and I'm thinking if I found a Yagi and a way to wire it in (right gauge and length), I might get a more consistent signal. Anyone have ideas about wiring something in? How would the 4G antenna physically receive a signal? The Yagi is cheap but $300 or so for an amp seems a bit much.