"Matt" wrote

Any thoughts?

Quarter wave antennas need a counterpoise to work properly --- are you testing
with the antenna mounted on the car? (It won't work properly sitting on the
floor of your shack, or on a wooden desk.)

If the antenna IS mounted on your vehicle, then you have a feedline (coax)
problem (shorted coax, open connector, etc.).

73, de Hans, K0HB