LMR®-400 (By the Foot or Spool)

LMR-400 bulk cable, available at rigcables.com, is a premium 50-ohm low-loss coaxial cable manufactured by Times Microwave Systems, offering exceptional performance for demanding RF applications. This high-quality coax features a foam polyethylene dielectric, aluminum tape outer conductor with tinned copper braid for superior shielding (>90 dB), and a durable UV-resistant polyethylene jacket, making it ideal for both indoor and outdoor use. It is available for purchase by the foot for custom lengths or in full spools of 500-ft for larger projects, providing flexibility to match exact installation needs without excess waste.

Compared to traditional RG-8U and RG-213, LMR-400 delivers significantly lower signal attenuation (lower loss), better power handling, and greater flexibility while maintaining a similar overall diameter (~0.405 inches). This results in improved transmission efficiency, especially at VHF, UHF, and higher frequencies, with reduced heating during high-power operation and easier routing in tight spaces. Typical applications include ham radio (amateur) antenna feeder runs, base station setups, wireless communications, GPS systems, jumpers, and other RF installations where minimizing signal loss and maximizing reliability are essential, making it a popular upgrade over older RG-style cables for modern setups.