GROUND PLANE ANTENNA 3DB GAIN AIRBAND 118-135 Mhz

Radiating Element: A vertical whip (typically ~¼ wavelength at the center of the band) is the main radiating section.

Ground Plane Radials: Several wires or metal rods mounted horizontally (or angled slightly downward) around the base act as a counterpoise (“ground plane”) that reflects and balances the signal. This simulates an ideal ground and improves impedance matching.

Monopole Behavior: The vertical whip over the ground plane behaves like half of a dipole — by reflecting its signal off the ground plane, it effectively radiates into space similarly to a dipole at a higher effective gain.