I have two identical garage door openers. One of them (and it happens to be on the wife’s side) has a very limited range. I have tried repositioning the antenna and changed the batteries in the remotes. The other one works fine. I see in the owner’s handbook that an antenna extender kit is available. Since the antenna is nothing more than a piece of wire hanging from the unit, would splicing an extra piece onto the end help. If not, what can I try? It works the same from both remotes and the external keypad mounted to the outside, so I know that it is not her remote that’s bad.