Wideband Car Antenna Mount

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Along the way of deciding to finally drill the holes and mount real antennas on my car for my ham radios, I came across an interesting NMO mount from Radial/Larsen that supports microwave frequencies.

I used a regular NMO mount for my 2m/70cm antenna for voice communications, dead center in the roof. I then drilled a second ¾″ hole for the Larsen NMOHF mount. This mount supports frequencies from 27 MHz to 6 GHz, so I can use it for VHF and UHF ham antennas, or for 802.11a/b antennas, either for Wi-Fi access or for ham radio networking. Above UHF frequencies, you remove the center pin and insulator to expose a coax-like connector. I like this conversion capability, and of the slim profile compared with the more typical N type mounts used for Wi-Fi antennas, but am curious to see how the losses will compare to an N mount fed with LMR-400.

So far, Larsen makes two 2.4GHz antennas for the microwave configuration of the mount: the NMO5E2400B whip and the LPT2400NMOHF (a so-called transit antenna, with a radome).

Author: Peter Sheerin

Peter Sheerin is best known for the decade he spent as the Technical Editor of CADENCE magazine, where he was the acknowledged expert in Computer-Aided Design hardware and software. He has a long-standing passion for improving usability of software, hardware, and everyday objects that is always interwoven in his articles. Peter is available for freelance technical writing and product reviews, and is exploring career opportunities in interaction design. His pet personal project is exploring the best ways to harmonize visual, tactile, and audible symbols for improving the effectiveness of alerting systems.

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