If you scroll towards the bottom of this page, there is a chart that shows"db gain over reference dipole" for various channels. Average gain for VHF-HI is 9.325db versus 8.2db for the HBU44. UHF average gain is 11.75db versus a dissapointing 8.2db for the HBU44 considering it's size.
I'm not sure why Winegard is so conservative with thier mileage estimates. Like I said, it just creates confusion when you see other brands with bloated numbers, so it's best not to rely on them for real world conditions. The gain numbers are a much better indicator of what to expect.Why does it say the range is 40 miles VHF and and 30 miles UHF then? Typo maybe?