20 Foot BNC Male to BNC Male LMR400 Coax Cable - Low Loss Outdoor

In this review the 20 ft BNC male to BNC male LMR400 cable is evaluated for ham radio operators, WLAN installers and anyone who needs a rugged outdoor feed line. The bottom line: this cable is for users who want a low-loss, flexible coax rated for outdoor exposure and long life; its LMR400 low loss construction and UV resistant polyethylene jacket make it a practical choice for antenna runs where durability and signal preservation matter most.

Key Features

• UV Resistant Jacket: The polyethylene jacket withstands outdoor exposure and is designed for an outdoor life expectancy in excess of 20 years, reducing the need for frequent replacement.
• Low Loss Performance: LMR400 construction delivers lower signal loss than most flexible cables of similar size, preserving RF energy over typical antenna runs.
• Flexibility and Bendability: The flexible outer conductor and design provide a tight bend radius, making routing around corners and through conduits easier.
• High RF Shielding: Multi-ply bonded foil outer conductor offers shielding far above single-shield coax, helping prevent interference in crowded RF environments.
• BNC Male Connectors: Fitted with common BNC male ends for quick, reliable connections to equipment that accepts BNC interfaces.

Who It's For

This cable suits hobbyists and professionals running antenna feeders for ham radio, CB, WiFi or WLAN installations who need a durable outdoor-rated coax that keeps loss low on moderate runs. Installers who value a balance between flexibility and shielding will appreciate its handling and long outdoor lifetime.

It is less appropriate for ultra-long backbone distribution where hard-line or larger-diameter low-loss cable would be preferable, or for installations requiring specialized connector types other than BNC without additional adapters.

Pros & Cons

Pros

• Low loss compared with other flexible cables, which helps signal strength over typical runs.
• UV resistant PE jacket rated for extended outdoor life, minimizing weather-related degradation.
• Excellent flexibility and tight bend radius for easier installation in confined paths.
• Strong multi-ply shielding reduces susceptibility to external RF interference.

Cons

• Supplied with BNC male connectors only, so other connector types require adapters or replacement ends.
• LMR400 is excellent for moderate runs but may not match larger hard-line cables for the very longest, lowest-loss backbone needs.

Specifications

Product Type	LMR400 low loss coax with BNC male ends
Length	20 ft
Impedance	50 Ohm
Jacket Material	UV resistant polyethylene (PE)
Connector Type	BNC male to BNC male
Shielding	Multi-ply bonded foil outer conductor (>90 dB rating)

Our Verdict

For ham operators, WLAN technicians and DIY antenna projects this 20 ft LMR400 cable offers an excellent mix of low loss, durability and flexibility at a reasonable value. It performs well on typical antenna runs and outdoor installations; buyers needing other connector types or the absolute lowest loss for very long trunk runs should plan adapters or a larger cable, but for most practical installs this is a dependable choice.

Frequently Asked Questions

Is this cable suitable for outdoor mounting?
Yes. The cable uses a UV resistant polyethylene jacket designed for outdoor exposure with a long service life.

What connector ends are provided?
This product comes fitted with BNC male connectors on both ends for straightforward connection to BNC-equipped equipment.

How long can this cable run and still perform well?
LMR400 is excellent for runs up to roughly 50-70 ft for WiFi/cellular and provides good performance for HF/UHF/VHF up to about 250 ft, though this 20 ft length is ideal for short to moderate feeds.