The LiftMaster 41A3504 External Receiver Antenna Kit is a factory accessory designed to improve remote control range and signal reliability for compatible LiftMaster radio receivers used with garage door openers, gate operators, and commercial door operators. By relocating the antenna away from metal housings and interference sources, this kit helps reduce signal drop-outs in challenging installations such as steel buildings, recessed control boxes, or equipment rooms. It is a passive antenna solution (no power required) that connects to the receiver’s external antenna input and can be mounted in a higher, clearer location for better line-of-sight to transmitters.
Engineered for residential and commercial applications, the 41A3504 is typically used with LiftMaster add-on and stand-alone receivers that provide an external antenna port, including common Security+ platforms found in North America. Installation is straightforward: power down the operator or receiver, connect the antenna lead to the designated antenna jack, mount the antenna in a vertical orientation away from large metal surfaces and high-voltage wiring, then restore power and test remote performance. For best results, follow the receiver/operator manual for frequency compatibility and antenna placement guidelines, and comply with local codes and UL 325 safety practices. This genuine LiftMaster replacement/upgrade part is ideal for restoring or extending remote control reception on receivers used with garage doors and automated gates in both residential and commercial environments.