Comet CTC-50M Window Feed-Thru Jumper - Close Windows Securely

In this review the Comet CTC-50M is examined for users who need a simple, non-invasive way to route coaxial cable through a closed window or sliding door. The bottom line: this flat, flexible feed-thru jumper is for radio operators and installers who cannot drill a hole and need a secure, low-loss connection point with UHF female (SO-239) connectors at each end. It delivers a practical workaround for temporary or semi-permanent antenna runs while protecting the seal of the opening.

Key Features

• Flat, flexible feedline: The low-profile design lets a window or sliding door close fully while keeping the cable and connectors safely inside the frame.
• SO-239 UHF female connectors: Standard UHF female ends simplify hookup to existing CB or two-way radio equipment without adapter fuss.
• 50 ohm impedance: Matches common radio systems to minimize reflections and maintain signal integrity for typical HF/VHF use.
• Low loss up to 500 MHz: Nominal loss of about 0.5 dB up to 500 MHz keeps signal attenuation low for most mobile and base station applications.
• Useable to 1300 MHz: The construction supports operation beyond VHF into higher frequencies when occasional higher-band use is required.
• 1 Year Manufacturer Warranty: Comes with a one year warranty that provides basic manufacturer coverage for defects.

Who It's For

The Comet CTC-50M is aimed at CB and two-way radio users, portable antenna installers, and anyone needing a temporary or reversible feed through a window without damaging the building. It is especially useful for renters, emergency operators, and vehicle-to-base setups where drilling is not an option.

Those who need permanent, weatherproof outdoor feedthroughs or the absolute lowest coaxial loss for long high-power runs should look at hardline or bulkhead feedthroughs instead, since this product is optimized for convenience and low-profile routing rather than permanent outdoor exposure.

Pros & Cons

Pros

• Allows windows and sliding doors to close while maintaining a secure RF connection.
• Standard SO-239 UHF female connectors reduce the need for adapters to common radios.
• Flat construction and flexible materials make installation quick and reversible.
• Acceptable low loss for VHF use and usable up to 1300 MHz for occasional higher-band needs.

Cons

• Not intended as a permanent outdoor waterproof feedthrough; long-term weather exposure could be a limitation.
• Nominal loss increases above 500 MHz, so it is not ideal when minimal loss is required at higher frequencies.

Specifications

Brand	Comet
Model	CTC-50M
Connector Type	SO-239 UHF female at each end
Impedance	50 ohm
Length	Almost 16 in
Frequency Range	Low loss to 500 MHz; usable to 1300 MHz
Warranty	1 Year Manufacturer Warranty

Our Verdict

The Comet CTC-50M is a practical, low-profile solution for routing coaxial cable through a closed window or sliding door without drilling. It is good value for radio hobbyists and temporary installers who need standard UHF female connectors and modest insertion loss; however, those requiring a permanent weatherproof feedthrough or the absolute lowest loss at higher frequencies should consider other options.

Frequently Asked Questions

Can I close my window or door with this installed?
Yes, the flat, flexible design is made so windows and sliding doors can close securely while the jumper remains in place.

What connectors are on the ends?
Both ends have SO-239 UHF female connectors to mate with common CB and two-way radio equipment.

Is this suitable for outdoor permanent installation?
No, it is intended for routing through a window or door and is not a sealed outdoor bulkhead; long-term outdoor exposure is not recommended.