I JUST BOUGH A SEARS DOOR OPENER MODEL # 139.53973SRT AND PUT IT UP. THE PROBLEM IS THE REMOTES WILL NOT WORK OUTSIDE WHEN THE DOOR IS CLOSED, OR OVER TEN FEET FROM THE DOOR. THE TROUBLESHOOTING GUIDE IN THE MANUAL SAYS SHORT RANGE IS THE PROBLEM BUT NO WAY TO FIX IT. THE IN STORE TROUBLESHOOTING GUIDE SAYS I MAY NEED AN ANTENA EXTENTION KIT. WHEN I CALL SEARS PARTS AND REPAIR THE MODEL NUMBER IS NOT LISTED AND NO ONE CAN HELP ME.