Depress the tabs on the underside of the cover at the back of the unit and remove the cover to expose the antenna connection.
Garage door remote range short.
It would only work with 1 remote etc.
Usually within 1 or 2 feet but once or twice as far as the garage door.
All current genie garage door openers specifically work on 315mhz 390mhz dual frequency to help reduce the likeliness of experiencing radio frequency interference.
Garage door opener remotes work on radio frequency waves typically from ranges of 300mhz to 390mhz.
I should note that the garage door opener was always spotty before.
Also equipped with auto seek dual frequency technology your garage door opener remote will automatically seek either 315 or 390 mhz which minimizes interference from surrounding devices and improves overall performance.
The range on the remote of my garage door opener liftmaster model 2110 or 2220 is suddenly so short that it barely works when the remote is outside the garage door.
The genie g3t r 3 button remote works up to 3 garage door opener systems manufactured from 1997 to the present.
After making all of the connections the garage door opener works but only with the remote at very short range.