It occurred to me what you meant when you said that you were receiving channels 2 to 69. If you are in the US you will get 7 to 51. The channels you mean by “2” or “69” are the virtual IDs, not the real channel frequencies. For example ABC in Atlanta is channel 2 but in reality is 39 (“2” being a holdover from the olden days). FOX is channel 5 but in reality is 27. The real channel numbers, based on their frequencies, run in the US from 7 to 51 (14 to 51 UHF). So the new 4 bay model based on larger whiskers will be valid in your case. In the olden days, the 50’s, the channels went from 2 to 83 and ABC actually did broadcast on 2 in days of yore. These stations changed their frequencies in the digital cutover period but kept their “names” (which however no longer reflected their frequency assignments).
Some older TVs get confused by these mismatched numbers. A friend’s ten year old TV assigned channel 46 to ABC though 46 is CBS in Atlanta because ABC broadcasts from Gainesville as 46 as a repeater station and consigned CBS to 19 (its true frequency). He could never find CBS since he was looking for it at 46 until we realized what was going on… TVFool shows both real and virtual channel numbers in its charts.