LiftMaster 86LM Antenna Extension Kit, 15' Cable

Extend and reposition your LiftMaster receiver antenna to improve signal reliability and reduce dropouts at the control panel. The LiftMaster 86LM Antenna Extension Kit is a control panel accessory designed for installers who need more flexibility in antenna placement without modifying the receiver. The kit includes an L-shaped bracket with a coaxial connection and a 15' coaxial cable, giving you range to locate the antenna for optimal reception and reduced interference.

Built for professional garage door operator and security installations, the 86LM fits common LiftMaster receivers such as 312HM, 412HM, 423-315LM/323LM, 422LM and 850LM. Note: the kit does not include the brass antenna—reuse the receiver’s existing antenna or order part K77-36541 for the 850LM, as that unit requires a specially tuned bent antenna. Using the correct antenna preserves tuning and maintains reliable performance for security, surveillance and monitoring applications.

Quick to mount and discreet in black/gray, this OEM extension kit streamlines installations and improves system uptime. Order the LiftMaster 86LM today to optimize receiver placement and strengthen signal integrity on your control panels, or contact us to confirm compatibility.

• Extend receiver placement up to 15' for improved signal reliability and fewer dropouts
• L-shaped bracket with coaxial connection simplifies neat mounting on control panels
• OEM LiftMaster fit ensures compatibility with 312HM, 412HM, 423-315LM, 422LM and 850LM receivers
• Preserves antenna tuning—use existing antenna or order special K77-36541 for 850LM to avoid detuning
• Ideal for security and monitoring applications where optimal antenna location is critical