[MilCom] Monitoring Antenna Height/Remote Antennas?

[Ken]

Seems to me that for military aviation monitoring antenna height might not 
be that critical.  For example at mnay (if not most) military bases (e.g. 
KCEF), the discones type antennas are mounted right on the buildings, 
basically just at roof level or a bit higher, not on towers.  Generally my 
monitoring experience is that Base Ops, Metro/Wx, & Command Post gets calls 
from C5 aircraft 30 minutes out, so I'd assume the aircraft are about 200 
miles away, probably flying at an altitude greater than 25K.  So for the 
monitoring hobbyists, perhaps an antenna just above the roof would work very 
well for most hobby monitoring applications?

Also is anyone away of any military aero radio communications antennas being 
remoted to a higher mountain or hill either on or off base?  When Westover 
ARB was a SAC Base many years ago it was rumored that the UHF radio 
transmitter was remoted to either Mt Tom (Holyoke MA) or another mountain 
(probably where "The Notch" underground command post was located (South 
Hadley /Granby/Amherst townlines  http://www1.shore.net/~mfoster/PACCS.htm).

Comments?

Ken