KMR400 Coaxial Cable 150ft 50 ohm Low Loss - Long Range Signal Cable

In this review the KMR400 Coaxial Cable 150ft is assessed for users who need a long, low-loss 50 ohm feedline for outdoor antennas, signal boosters, or RF testing. The bottom line: this 150 ft KMR400 is aimed at installers and hobbyists who need minimal signal degradation over distance, offering an Ultra Low Loss profile and weatherproof construction that make it practical for outdoor runs and higher frequency use.

Key Features

• Ultra Low Loss: Measured at under 5.4 dB loss at 900 MHz over 150 ft, the cable preserves more signal than thinner coax on long runs.
• Low SWR: The cable reports an SWR around 1.15 which helps maintain efficient power transfer for transmit and receive applications.
• Robust Conductors: A copper clad aluminium inner conductor combined with aluminum foil and aluminum-magnesium braid provides solid shielding and consistent conductivity.
• Weatherproof Jacket: The PVC outer jacket is built for outdoor exposure so the cable can be routed outside without immediate weather concerns.
• Wide Compatibility: Works with any 50 ohm RF system including cell phone boosters, WiFi repeaters, CB and ham radios, and common connector types like N, SMA and BNC.

Who It's For

The KMR400 150 ft cable is best for installers, amateur radio operators, and system builders who must run a long coax line with minimal signal loss between antennas and radios or boosters. Its low loss and low SWR make it appealing where every dB of received signal matters, such as weak-cell areas or long mast drops.

It may be less suitable for very compact indoor runs where a thinner, more flexible coax is preferable, or for applications requiring a specific factory-terminated connector - this listing includes the bulk 150 ft cable only. Buyers needing pre-terminated or specialty connectors should plan to purchase connectors and perform terminations or seek a pre-made assembly.

Pros & Cons

Pros

• Low insertion loss across long runs at cellular frequencies, helping preserve signal strength.
• Sturdy construction with CCA center conductor and dual shielding for good noise rejection.
• Weatherproof PVC jacket suitable for outdoor routing and typical installation conditions.
• Broad compatibility with standard 50 ohm systems and common RF connectors.

Cons

• Bulk supply is unterminated, so users must attach connectors or pay for professional termination.
• Center conductor is copper clad aluminium (CCA) rather than solid copper, which is typical for this class but not top-end.

Specifications

Length	150 ft
Impedance	50 ohm
Loss at 900 MHz	< 5.4 dB
SWR	Approximately 1.15
Inner conductor	Copper clad aluminium
Outer conductor	Aluminum foil + aluminum-magnesium braid
Outer jacket	Weatherproof PVC

Our Verdict

The KMR400 Coaxial Cable 150 ft is a practical choice when a long, low-loss 50 ohm run is needed at a sensible cost; its low loss and weatherproof jacket make it well suited to outdoor antenna drops and signal booster installs. Installers who can terminate connectors will find it good value for preserving signal over distance.

Frequently Asked Questions

Does this cable come pre-terminated?
No, the package contains a 150 ft length of bulk KMR400 coax and does not include pre-attached connectors or the wooden spool pictured.

Is this compatible with my 50 ohm antenna?
Yes, the cable is designed for any 50 ohm RF system and is compatible with common connectors such as N, SMA, BNC, TNC and TS9 when properly terminated.

Can it be used outdoors long-term?
Yes, the PVC jacket is weatherproof and suitable for outdoor routing, though standard best practices for UV protection and sealing terminations still apply.