JPL's Wireless Communication Reference Website Slide Show
Macro-cellular groun wave propagation
For dl >> 4 hr ht, we approximate sin(x) + x:
Egli [1957]: semi-empirical
model for path loss
Loss per distance:................ 40 log d
Antenna height gain:............. 6 dB per octave
Empirical factor:................... 20 log f
Error: standard deviation...... 12 dB
