GEMEK 36ft PL259 to PL259 Low-Loss S-MR400 Coax Cable - Long Run

In this review the GEMEK 36ft PL259 to PL259 Low-Loss S-MR400 Coax Cable is evaluated for hobbyist and pro radio use; the bottom line is that it delivers noticeably better signal retention for HF, VHF and UHF than thin jumper cables, making it a practical choice for longer runs and antenna testing. The review focuses on real-world handling, build details and where this cable stands compared with smaller-diameter coax, so readers can decide if the larger S-MR400 construction and PL-259 male ends match their rigs and installation needs.

Key Features

• Low-loss S-MR400 cable: The larger 0.4 in diameter construction keeps more signal on HF/VHF/UHF runs compared with smaller coax for improved range and fidelity.
• 36 ft length: The 11 m length suits common antenna setups and analyzer work without adding connectors that can increase loss.
• PL-259 male to PL-259 male connectors: UHF PL259 terminations make the cable ready to plug into most ham rigs, SWR meters and CB equipment without adaptors.
• 50 ohm impedance: Standard impedance supports transceivers, antenna analyzers and SWR meters designed for 50 ohm systems.
• High-density tinned copper braid: The double-shield braid offers near 100% shielding for lower RF leakage and better noise rejection.
• Durable fit range: Heat shrink on both ends and an operating temperature range from -20C to +70C makes it usable in outdoor or garage installations.

Who It's For

This cable is aimed at ham radio operators, CB users, and anyone who needs a reliable 36 ft jumper for antenna analyzers, SWR meters or transceivers where maintaining signal over a longer run matters. The larger center conductor and double shield are helpful when moving from short patch leads to a cable that will preserve performance at VHF and UHF frequencies.

Users who require ultra-compact or extremely flexible mini-jumpers for cramped portable setups may find this cable bulkier than alternatives; also, if you need a different connector type you will need an adapter or a different cable since this product is PL-259 male to PL-259 male only.

Pros & Cons

Pros

• Noticeably better VHF performance and lower loss than RG58-style cables due to the larger S-MR400 conductor.
• Solid shielding and double-shield braid reduce noise and improve SWR readings in many installations.
• 36 ft length is versatile for home stations, antenna analyzers and mid-length runs without additional joins.
• Heat shrink on both ends improves weather resistance at the connector transition points.

Cons

• Some customers report mixed build impressions around connector quality, so results depend on handling and installation care.
• The cable is thicker and less flexible than smaller coax, which can make tight routing or portable use more cumbersome.

Specifications

Connector	UHF PL259 Male to UHF PL259 Male
Length	36 ft (11 meters)
Impedance	50 ohm
Cable type	Low-Loss S-MR400 Coax
Diameter	10.3 mm / 0.4 in
Operating temperature	-20C to +70C
Minimum bending radius	2.44 in

Our Verdict

The GEMEK 36 ft S-MR400 PL259 jumper is a pragmatic upgrade for users who need improved HF/VHF/UHF performance over longer runs without frequent connectors. It balances noticeable signal retention, solid shielding and durable finishes at a modest cost, making it a good value for home stations and antenna testing; those needing ultra-flexibility or different connectors should consider alternate cables or adapters.

Frequently Asked Questions

Will this cable work with my ham transceiver?
Yes, the 50 ohm impedance and PL-259 male connectors are compatible with most ham transceivers and SWR meters that accept UHF PL259 ends.

How flexible is the cable for tight installations?
The S-MR400 is thicker than RG58-style coax and less flexible, though its minimum bending radius is about 2.44 in and it can handle 90 degree bends in short spans without signal loss.

Is the shielding sufficient for outdoor use?
The high-density tinned copper braid and heat shrink on both ends provide strong shielding and decent weather resistance, but good connector sealing is recommended for prolonged outdoor exposure.