Comet CM-5M Mobile Antenna Magnet Mounts CM-5M - Compact Mag Mount

In this review the Comet CM-5M mobile antenna magnet mount is examined for mobile radio and CB users who need a simple, portable mounting solution. The bottom line: the CM-5M is for operators who value a compact, well-built mag mount with an integrated SO-239 and a long coax lead for flexible placement. It performs reliably for temporary installations and field use, and its 13 ft RG-58A/U cable gives reach for routing to a vehicle interior. While magnet strength receives mixed feedback, the build quality and functionality make it a practical choice for many.

Key Features

• Mag mount base: A 4.5 in mag mount base provides a quick, no-drill attachment method that works well for temporary and mobile setups.
• SO-239 connector: The built-in SO-239 mount simplifies antenna attachment with a standard PL-259 plug interface for common CB and mobile antennas.
• 13 ft coax: The included 13 ft RG-58A/U cable allows flexible routing from the antenna to the radio without immediate need for extensions.
• Durable construction: The mount is made to withstand regular handling and outdoor conditions, supporting reliable on-the-road use.
• Compact footprint: At 4.5 in the mag base remains unobtrusive on roofs and trunks, minimizing obstruction while still providing a stable platform.

Who It's For

The CM-5M suits CB and two-way radio users who need a portable, easy-to-install antenna mount for temporary installs, events, or vehicles where permanent mounting is not desired. It is especially useful for operators who rely on a PL-259/SO-239 interface and want a ready-made solution with a long RG-58A/U cable included.

Users who need extreme magnetic hold for high-speed driving or heavy vibration may want to consider permanent or larger mounts instead, since customer feedback shows magnet strength can be mixed depending on vehicle surface and conditions.

Pros & Cons

Pros

• Compact mag mount design makes installation quick and reversible without tools.
• Included SO-239 mount accepts standard PL-259 antenna connectors for wide compatibility.
• 13 ft RG-58A/U coax provides ample length for routing into vehicle cabins without extra cable purchases.

Cons

• Magnet strength has mixed reports from customers and may be less secure on some painted or curved surfaces.

Specifications

Mount type	Mag mount
Magnet diameter	4.5 in
Connector on mount	SO-239
Included cable	13 ft RG-58A/U
Compatible plug	PL-259
Intended use	Mobile/CB and two-way radios

Our Verdict

The Comet CM-5M is a sensible, value-oriented mag mount for users needing portability, standard PL-259 compatibility, and a long coax lead. Its solid build and straightforward design make it a good fit for temporary mobile installations, though those requiring maximum magnetic hold should verify fit on their vehicle surface. Overall it delivers dependable functionality for most CB and mobile radio needs.

Frequently Asked Questions

Does the mount include coax cable?
Yes, the CM-5M ships with a 13 ft RG-58A/U cable attached to the mount for convenient routing to your radio.

What connector fits the mount?
The mount uses an SO-239 on the base and accepts standard PL-259 antenna plugs.

Is the magnet strong enough for highway speeds?
Customer feedback is mixed on magnet strength; it holds well on flat, clean metal but may be less secure on curved or painted surfaces, so test before extended high-speed use.