Recent negotiations with various local channels are not going too well and Dish has had to temporarily drop some local channels in certain area, so Dish is offering a free OTA antenna for some of there affect customers. Here is the note from their www.dishpromise.com
DISH offering "over-the-air" antennas to watch Tribune's local broadcast channels
While DISH works to reach an agreement, the company is offering "over-the-air" antennas at no cost so that customers in affected markets can watch Tribune's local broadcast channels for free. DISH customers must call 1-800-333-3474 to confirm market eligibility and system compatibility.
Not sure what kind of antenna you will be getting though