This article is from the ER FAQ, by Rose Cooper email@example.com with numerous contributions by others.
If you have a satellite dish and live in North America,
you can watch "ER" at 10E/9C/8M/7P on Satcom C1 (also called F1),
transponder 8. This is the NBC East Coast feed and is unscrambled.
Those times also apply to WXIA (Galaxy 4, 22) and WHDH (Spacenet 4,
2); these channels are scrambled, however, and you must have a
subscription with a dealer that provides them.
"ER" also airs on the subscription channel KUSA (Satcom
C1, 14) at 11E/10C/9M/8P; and on the subscription channel KNBC
(Spacenet 4, 6) at 1:00AM-E/12C/11M/10P.
All of the above are on Thursday nights, when NBC normally
airs "ER". However, for weeks when a new episode is airing, you
can see an early feed on Wednesday nights. It can be seen on
Telstar 401, transponder 7, at 12:00PM-E/11:00PM-C/10M/9P. This
version of the show is completely commercial free, and airs the
full opening and closing (full-screen credits & no voice-over
announcer), as opposed to the half-screen credits and voice-over
that most NBC affiliates use.
If you have Ku band capability, you can also watch ER on K2,
transponder 1 at 10 PM E/9C/8M/7P, and on K2, transponder 3 at
1 AM E/12 Midnight C/11M/10P.