Extra wide bandwidth -more than 500 kHZ- without counterpoise. The images show WormAnt TMC in various environments and the associated roe curves.
Horizontatlly attached to the door:
Vertically on the car roof with a magnetic base:
Directly on the ground with no radials:
Some image details:
Compare WormAnt TMC (mobile) versus Wormant STA (ground) RX on 40 m band: