Lowest cost: DK-3, by Don Johnson, v3 (A professional looking coil cover is available)
Highest gain (least loss): Hi-Q, Hi-Q-5/160 RT..

HAM brand (commercially made, similar to DK-3's.
Most only cover 80-10M, some include 6M and 160M):
N7LYY, 160-6M, 400W...
KJ7U, 80-6& 160-6M, 600W& 1,000W....
Tarheel antennas...
Band Hopper...
Texas Bug catcher, Texas Twister - 2000
High Sierra
The Screwdriver antenna Co...
Even, MFJ?

A "eHam" page on HF antennas...

Your Brand? Contact me...

A HAM web site on antennas...

A Goggle Search on Screwdriver HF antennas
 

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