They're trying:
http://www.democraticunderground.com/discuss/duboard.php?az=show_topic&forum=132&topic_id=1021550
"some info for activists here:
JAM THEIR F**KING PHONE LINES!
Corporate Headquarters
Sinclair Broadcast Group, Inc.
10706 Beaver Dam Road
Hunt Valley, Maryland 21030
410-568-1500 (Main Telephone)
410-568-1533 (Main Fax) "{...snip...}