This article is from the Space FAQ, by Jon Leech email@example.com and Mark Bradford firstname.lastname@example.org with numerous contributions by others.
NASA SELECT is broadcast by satellite. If you have access to a satellite
dish, you can find SELECT on SpaceNet 2, Transponder 5, C-Band, 69
degrees West Longitude. SELECT has been moved from Satcom F2R to a
satellite even further to the east, and is apparently even more
difficult to receive in California and points west. During events of
special interest (e.g. shuttle missions), SELECT is sometimes broadcast
on a second satellite for these viewers.
If you can't get a satellite feed, some cable operators carry SELECT.
It's worth asking if yours doesn't.
The SELECT schedule is found in the NASA Headline News which is
frequently posted to sci.space.news. Generally it carries press
conferences, briefings by NASA officials, and live coverage of shuttle
missions and planetary encounters. SELECT has recently begun carrying
much more secondary material (associated with SPACELINK) when missions
are not being covered.