Recently, kontiki posted:

When airports are really close together its a good thing to share
CTAF frequencies... so you know what's going on at each place because
the airspaces basically merge. You really appreciate the situational
awareness.

While that may be true of CFAF in some cases, it's not true of ASOS. For
example, in my vicinity there are 2 towered airports (as well as a Class B
and another Class D about 20 nm away in opposite directions). One ASOS is
located on a lake shore (600 ft. ASL) and another inland 10 nm away at 900
ft. ASL. The conditions at one is often not the same as the other. If both
ASOS were on the same frequency such that one steps on the other, it would
not be good.

Regards,

Neil