My two copper washed Zinc pennies:
1) Any antenna that gets VHF and UHF signals is digital and HD.
2) The signal carriers have not changed; only HOW the signal is formatted did. Decoding the content is the job of the TV's tuner and not the antenna.
3) MOST new digital channels are UHF; BUT it is the shortest range of the two types of antennas (UHF and VHF).
4) The "BATWING" of the "standard" Wineguard (Sensar I through III) is the DIRECTIONAL VHF element and there is a circular omnidirectional UHF (like the old wire loop that used to go on the back of the TV) in the white amp housing.
5) There ARE VHF digital stations; but MOST are UHF.
6) Digital content DOES NOT "come in fuzzy"; it either works great or cuts out intermittently (pixelated) completely (no signal at all).
7) Adding additional "leading" elements (like the Wineguard Wingman does will focus the weaker signals onto the loop antenna and thereby boost the signal (increase the gain). This allows greater range; BUT the elements must be rotated to point AT the transmission tower JUST LIKE the bat wing needs to be 90 degrees to the line to the tower.
Picture an airplane with the batwings being the wings and the leading elements (or white amp) being the cockpit.
Use software like antenaweb.org
to find the towers and distance/aimpoint to them.
Use a TV service like titantv.com to find out what is on in your camping area.