There are still analog stations broadcasting on UHF bands and VHF bands.
There are digital signals being broadcast in the UHF band and the VHF band as well.
The frequencies have nothing to do with the form of the data being sent; it is just the carrier of the data being transmitted.
UHF stands for Ultra High Frequency wavelengths
VHF stands for Very High Frequency wavelengths
Both are still in use, its just you can cram a LOT more "digital channels" into the same space (wavelength) used by an analog channel.
If you go to www.antennaweb.org
you MAY find analog channels still in use in your area. You will still need the "wings" on your RV antenna to pick up the VHF digital channels.
To answer why the Wingman "works without wires":
1) How the "OLD" antenna worked. The wings of the Winegard style antenna are directional VHF antenna lobes. (Think Rabbit Ears) The control head (the white box) contained a NON-directional loop antenna (Think that loop of wire that used to come free with a new TV back in the day) and a signal amp powered through the Coax from the wall plate controller (little button with green light).
2) Add Wingman and you make that non-directional loop directional by using those narrow to large elements to "bend" the incoming UHF signal like a magnifying glass to focus more RF energy onto that non-directional loop UHF antenna. The "Arrow head" of the wingman MUST point directly to the broadcast tower to be most effective.
HIGHLY recommended that you find out that heading and distance from www.antennaweb.org so you know where to point for a specific channel you want to watch.
There is a great mod that uses a circular protractor mounted in a ring around the crank to make pointing a snap once you spin it to "north" and mark the direction of the "arrow."
3) Again, it ONLY works to amplify UHF band signals. (However, since the majority of the newer channels are in the mostly unused UHF band, this is a good thing)
4) Since RF energy dissipates by the square of the distance from the source, UHF reception is local only by nature. VHF has longer range and can pick up stations further away.
5) since digital is "mostly" all or nothing, ANYTHING that amplifies the RF energy will allow you to "see" more displayable quality signals and thus more channels.
6) OR its f...'ing magic and leave it at that.