The add on available to the Wingman is to improve reception of UHF channels. That's important because after the switch over to digital a couple years back, the majority of TV transmitters also switched to the UHF band. Although one may still be watching
"Channel 2" which is a VHF channel for example, most likely the actual frequency it's being transmitted on is in the UHF range, in my local area for example channel 2 actually broadcasts on UHF channel 29. Digital receivers "map" the channel to 2 though on tv receivers. This was done to eliminate confusion as channels wanted to keep their heritage identity. I know to some this may be confusing, but in a nutshell, yes the Wingman add on will definitely help. There still are some VHF channels being broadcast, and the original batwing Wingman in conjunction with the add on will still be utilized for them.
One more thing regarding over the air tv reception. Just as in real estate, the three most important factors in good tv reception are location, location and location. Close proximity to tv transmitting towers and unobstructed terrain are essential to good tv reception. Tall transmitting towers on high hills/mountains can transmit up to 100 miles. Put a hills or mountains in the way of where you are and a transmitter tower will lower the distance considerably to as little as a few miles.
Additionally, what used to be acceptable as a snowy picture in the analog days now will translate in the ones and zeros digital age to a pixelated picture or none at all.
(Technical explanation; UHF are a shorter wavelength than VHF, thus the shorter elements of the add-on improve UHF reception)