David Eduardo wrote:

Our experience at KTNQ is the oppostite. Many places where the analog
signal is noisy have HD reception that is pristine.

HD expands the coverage area of KTNQ due to the high noise level on the
analog signals in LA.

IBOC doesn't seem to improve weak signal coverage, especially not within a
steel frame bldg. Indeed, someone in a car listening a signal wiped out by
power lines might get an improvement if the IBOC signal is strong enough,
but weak signal usually switches to analog reception which leaves the
listener in the same position as before, no available signal.