Shunt feed a hustler mobile HF Antenna
Improve SWR and performance on 40m and 20m with a simple shunt-feed coil.
Description
Demonstrates a shunt-feed matching technique for Hustler mobile HF antennas, specifically the MO-3 mast with RM series resonators, to achieve optimal SWR on the 40-meter and 20-meter bands. It details the construction of a loading coil using 20 turns of #12 solid wire, 1.25-inch ID, spread to 5 inches, and provides tap points: 8 turns for 40m and 4 turns for 20m, connecting one end to the feed point and the other to ground.
The resource presents specific SWR results, noting a 1:1 match at 7.258 MHz on 40m and 14.275 MHz on 20m, with SWR remaining below 1.5:1 across significant portions of the General phone segments. It highlights a noticeable improvement in both transmit and receive performance compared to a straight antenna setup, emphasizing the practical application of this matching method for mobile installations, particularly on a fender-mounted ball mount.