vertical dipole is omni-directional in horizontal plane
G(f) = 1.5
Uniform angle of arrival of reflected waves
Many weak i.i.d reflections; no dominant wave
Centered around fc
Width 2 fD
Magnetic loop antenna
G(f) = 1.5 sin2 (f - f0)
with f0 the direction angle of the antenna
This antenna removes some portion of the spectrum