This antenna can be FIT anyway with a good GROUNDING
Resonance (x=0) for 10 and 20 meter band.
I rx some station when I test the 20 meter band,
station from VU, VR,VK, BG and BA
all station RX 55 !!!
Tested on my FT897 with a GOOD GROUND connected.
1:1 swr on 14.200 !!!
also tested with my MFJ-259B antenna analyzer.
Match efficiency more than 95%
The only problem to use this antenna,
" Must have a GOOD GROUNDING !!"
20 meter band Helix mobile antenna.
10 meter band Helix mobile antenna .