One other thing; make sure you can actually receive more stations at your location AND your antenna is pointed in the correct direction.
Digital signals are way more directional than the old analog kind. Perhaps you only need an adapter to get the farther UHF digital signals (like the Winegard Wingman).
I use AntennaWeb - Home
to locate the available channels and what direction to point the antenna. TitanTV.com will let you know what is on.
Here are some photos of our campsite at MacDill AFB Fl and the channels and direction to point the antenna. Remember to treat the white box of the Winegard as the cockpit of an airplane and the "batwings" as the wings of the plane. You need to point the antenna like an airplane and "fly" to the transmission tower(s).
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW