Bob Gardner wrote:
Isn't the localizer antenna down at the other end of the runway? If a pilot
is departing from the end, the localizer signal should be 700 feet wide at
that point.

I've had discussions with the FAA's flight check pilots as they are out
flying approaches checking our navaids. The critical area can be for
both the GS and Loc. Their equipment is so good in the flight check
aircraft they can tell if a person walks across the middle of the runway
from a 10 mile final.