Not been quite that long yet. Dish Network just launched in 1996 and DirecTV/USSB/DSS in 1994. Locals didn't come around until 1998-1999 and really into their own about 2001 or so when the first spot beam DBS birds came online.
Guess it just feels longer.
The EKB list says April 2004 for the market I was in, it shows the first 13 markets in 1998.
http://dishuser.org/sdlocalbydate.php
I don't recall ever having an antenna at that place from the time I moved in '99. I vaguely recall trying to watch a CFB game with rabbit ears once and that not working out.
But I have been a satellite only since 1995 or 96, once I got out of places that I couldn't put up a dish (and included cable as part of the rent/housing fee).
And I had satellite at my parents place from ~ '86. I remember when we finally got a motor for the dish and having to go out and crank to change satellites before that (lining up pencil marks on the jack), and the monthly issues of Orbit.