My EVO has held down to -131, not a very good but it kept it for about a minute before i got to a better signal. My mom has a S3 and has a problem connecting to 1x in our metal office building when my EVO gets 3 bars. We have Wifi so LTE usually disconnects before I even get a chance to check it but when my wifi is off my LTE stays connected on usable with 3-4mbps up and down while her S3 cant even connect standing in the parking lot with -80 to -90 depending on witch side of the building you are. The weird thing is on the same tower but a different sector she can connect just fine.
Back to the original topic, There are at least 3 more towers here in Winchester. They are somewhere around exits 315, 313, 310.
Robert, you still haven't added Front Royal from where I mapped back in Oct.