Here's the source from Dishnetwork.com:
Eligibility. Services and equipment must be ordered, installed, and activated between and including February 1, 2006 and April 30, 2006. This offer is limited to: (i) new, first-time residential DISH Network subscribers and (ii) former residential DISH Network subscribers who: (a) previously maintained for no less than six consecutive months an active DISH Network account in good standing status as determined in DISH Network's sole discretion; (b) voluntarily disconnected any and all prior DISH Network accounts; (c) timely paid any and all balances owing under their prior DISH Network account(s) in full; and (d) have not received DISH Network programming or other services during the six-month period prior to activation under this promotion ("Former DISH Network Subscribers")