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DIRECT THREAD-ON adapter for the Harvest HD-330 screwdriver antenna.

The HD330 uses an unusual / proprietary thread that makes it not possible to use a standard whip or stinger with the normal 3/8x24 thread. Only the telescopic antennas that come with it are able to thread onto the coil. This adapter solves that very real problem ! It threads directly onto the proprietary thread on the top of the coil. It is secured with a stainless steel set screw at the very bottom (as to not damage the threaded stud on the coil). This allows you to use a 0.125 inch (1/8 inch) steel stinger whip/ antenna / whip

This adapter is available in two (2) different versions. This one with the 1/8 hole on top and a set crew. And also available with a standard 3/8 X 24 female thread in the top for threading in any type of fiberglass or steel whip from 36 to 102 inches or a spring or other accessory.

I have tested and used a Harvest HD330 screwdriver antenna with 36 inch to 65 inch stainless steel stinger whips. The antenna tunes from 80 meters to 10 meters with no issues. The 60 inch whip seems to be most efficient. The Harvest HD330 screwdriver antenna is available from JNR on Amazon and on eBay.

Hand Made and Individually Machined in Evansville, Indiana USA