KMR400 Coaxial Cable 200ft Low Loss KMR400 Cable - Long Run Signal

Our review looks at the KMR400 Coaxial Cable 200ft, a purpose-built 50 ohm run for anyone needing a long, low-loss RF feed. The bottom line: this cable is for installers and hobbyists who must move signals across long distances with minimal degradation - its reported loss of under 7.2 dB at 900 MHz and SWR near 1.15 make it a practical choice for cell signal boosters, WiFi repeaters and ham radio feeds where a durable, weatherproof line is required.

Key Features

• Ultra low loss: The cable keeps signal loss to under 7.2 dB at 900 MHz, helping preserve RF power over a 200 ft run.
• Low SWR: A reported SWR of about 1.15 reduces reflections and improves matching for many 50 ohm systems.
• Durable conductors: The inner copper-clad aluminum conductor and aluminum-magnesium braid provide a balance of conductivity and mechanical strength for long-term use.
• Weatherproof jacket: A PVC outer jacket enables indoor or outdoor routing and holds up in harsher environments.
• Wide compatibility: Works with any 50 ohm RF system and accepts common connector types such as UHF, SMA, BNC, TNC and N when fitted.

Who It's For

This cable is aimed at installers, amateur radio operators and anyone fitting signal boosters or long antenna runs who needs a consistent 50 ohm feed over 200 ft. The emphasis on lower loss and a stout outer jacket makes it suitable for rooftop or mast runs where exposure and distance matter.

Those who need ultra-high performance for professional test lab work, or a factory-terminated assembly with specific branded connectors included out of the box, should look elsewhere; this offering is a bulk 200 ft cable that will require proper connectors and installation to realize full performance.

Pros & Cons

Pros

• Low measured loss at 900 MHz helps maintain signal level over a long 200 ft run.
• Robust construction with copper-clad aluminum conductor and aluminum-magnesium braid for good shielding and durability.
• Weatherproof PVC jacket allows indoor or outdoor routing without immediate concern for abrasion or light weather exposure.

Cons

• Supplied as plain bulk cable without a wooden spool pictured, and connectors are not included, so additional parts and tools are required.

Specifications

Length	200 ft
Impedance	50 ohm
Loss at 900 MHz	< 7.2 dB
SWR	Approximately 1.15
Inner conductor	Copper clad aluminum
Outer conductor	Aluminum foil and aluminum-magnesium braid
Jacket	Weatherproof PVC

Our Verdict

The KMR400 200 ft coax is a practical, value-oriented option for long 50 ohm runs where keeping loss low matters more than factory-terminated convenience. It offers a good mix of low loss, durable conductors and a weatherproof jacket, making it a sensible buy for installers and radio enthusiasts who will attach their own connectors and need reliable performance over distance.

Frequently Asked Questions

Can this cable be used outdoors?
Yes, the PVC jacket is weatherproof for typical outdoor routing, though good sealing at connection points is advised.

Is this the same as LMR400 or RG8U?
The manufacturer states KMR400 is equivalent to LMR400 and comparable to RG8U in general construction and performance.

Are connectors included?
The package includes the 200 ft cable only; connectors and termination tools are not included and must be purchased separately.