A top or bottom-fed Loop has MINIMAL response to Vertical Polarized signals....and
a side-fed Loop has MINIMAL response to Horizontal Polarized signals.
To see H, V & Total Gain responses, in 4nec2's PATTERN box, under "Far-field", enable
"Show Multi-pattern"...or just hit the "M" key.
RabbitEars tracks status of Circular ("C") and Elliptical ("E") Polarized Station (U.S. Only):
K6STI's analysis Circularly Polarized Quadix, Cubical Quad, Loop & Rabbit-Ears FM Antennas:
Can Rescale to Lo-VHF, Hi-VHF or UHF Bands....
Two alternative designs for Hi-VHF 5.5-Turn (103-in) Helical Antennas with FLAT
Reflectors can be found here, if you are interested in DIY Circular Polarized antennas:
I included some design references if you want to do your own design (good luck....)
If you're interested in longer, higher Gain, narrower bandwidth alternatives,
try adding more turns to the above....
Or try to copy one of the fol. Wade Helical Antenna designs: