High Sierra Antennas is kaput. The basic parts are 'almost" identical to Tarheel's 200A series. The main difference, is the contact assembly, gear motor, and the quick disconnect at the bottom. The actual tube is identical, save for where the holes are drilled for the various sub-assemblies. High Sierra used a mickey mouse, brass cone assembly as a quick disconnect, which always corrodes due to poor maintenance, and can vibrate loose causing all sorts of maladies. With a little due diligence, the Tarheel QD can be used. The Tarheel coil, coil cover, the end pieces, are all usable. It isn't a slam-dunk, but at least you can fix (resurrect) an old, inoperative High Sierra if you just have to! If you need technical help, Robert Young is Tarheel's resident guru. Yes, he will try to talk you into purchasing a new Tarheel, but the truth is, he's usually correct! Mobile operators have to remember, that the antenna is a part that wears out over time. Like a pair of shoes that you can resole, sooner or later, the uppers give out, and you have no choice but to replace the whole shebang. One more item. Over time, the main tube becomes stressed, particularly at the top of the U-shaped mounting bracket. The usual result is the main tube (mast if you will), fails. If yours shows signs of failure, bite the bullet, and buy a new Tarheel 200A.