BA,

Plus since the 1950s & 1960s the number of 'Regional'
non-clear-channel broadcasters have been increased and added to the
"Clear Channel" Frequencies. So the result is that here are really no
more Coast-to-Coast (Border-to-Border) AM/MW Radio Stations anymore.

Your example of the Directional Antennas "DA" used by the West Coast
'clear channel' radio Stations is True.

KGO 810 kHz @ 50KW using a "DA" in the SF Bay Area is very strong
North and South. But KGO is very 'weak' during the Day and can
'fade' at Night up here in the Sierras (Twain Harte, CA) due East of
the SF Bay Area. Some of the Monterey/Santa Cruz Bay Area
broadcasters that use 1/10 the power of KGO have better signal up hear
during the day.

KCBS 740 kHz @ 50KW does NOT use a "DA" in the SF Bay Area is strong
North, East and South. During the Day KCBS has a 'fair' signal and at
Night the signal is strong.


~ RHF
..
..
= = = "Brenda Ann"
= = = wrote in message ...
"starman" wrote in message
...


The greatest boundary to bi-coastal AM DX is not geographical at all.. but
purposeful. Stations that have high power at night have very directional
arrays that protect other stations on the same frequency. Most on the west
coast have N-S or similar patterns that keep them from being heard on the
east coast. For instance, KOMA (or whatever they are this week) in OKC and
KKSN in Portland, OR must protect each other's nighttime coverage. (both are
1520 KHz).

An interesting point... I have yet to see a directional array here in the
ROK.. and it shows.. at night there are so many stations fighting over any
given frequency that it numbs the mind. Most of the winners are Russian and
Chinese. I have only ever heard one Japanese MW station here..