In article
ogers.com,
David Megginson wrote:

Teacherjh wrote:
The longer runways are more likely to have critical areas.


Why?

The localizer will be closer to the (opposite) runway threshold.


All the best,


David

Why should runway length affect how far the localizer antenna is from
the runway end?

Localizers are designed to have a fixed width (something like 700 ft
lateral displacement for full-scale deflection on the CDI) at the
arrival threshold, so longer runways will have narrower angular beam
widths. But (to the best of my knowledge) this is done by adjusting the
spacing of the transmitting elements on the localizer array, not by
adjusting the distance of the array from the runway end.