Total posts : 45366
Ermi wrote: A typical urban atmospheric noise level in the AM broadcast band is .15 mV/m. This is a S/N ratio of just over 3 if the signal is at .5 mV/m. This is very noisy. .5 mV/m might be good enough in a rural setting if the receiver is of good quality.
This may be true in some regions, but I live in a small city just beyond the 0.010 millivolt/meter groundwave contour of WHO, and, while my daytime reception of WHO is quite noisy, I can listen to a talk or news show on WHO without missing a word, using just a cheap, indoor GE AM/FM clock radio with its internal loopstick antenna.
The link below leads to a groundwave coverage map for WHO, which takes into account the effect of ground conductivity in this region. WHO is a 50 kW Class A, 24-hr, omnidirectional station on 1040 kHz.