To receive your weakest stations (ABC, CW) you need to point the Antenna more towards 340-deg (re True North) than the powerful stations towards as far away as 270-deg. [And perhaps also 359-deg for a total Angular Spread of 89-deg....at RIGHT ANGLES...but not to worry, it CAN be done....unless Multipath causes some nasty reality bites.]
RCA must figure that customers are only confused by "Specs"...so they don't disclose any for pretty much ANY of their products. However, if you look at the W-G HD7000, you'll see that the UHF element on the Front of the Antenna are identical to ANT-751...and the long elements on the HD7000 for Ch2-13 have be redesigned with shorter elements designed for Hi-VHF (Ch7-13). I modeled ANT-751 and found that the Hi-VHF performance was very close to the HD7000...and of course the UHF performance is Identical:
Note that UHF (Ch14-51) Beamwidth varies from 75-deg on Ch14, to 56-deg on Ch33 and ONLY 40-deg on Ch50....and note deep nulls off to the sides.
Antennacraft is only a BIT better...they provide ONE NUMBER for the entire Band but don't indicate whether it's a MIN, a MIX, an AVERAGE...or something else....and don't want to confuse us with actual Azimuthal Pattern Charts. FWIW, they claim 52-deg Beamwidth for HBU-33 in UHF Band....I'm guessing it's probably AVERAGE, based on specs for "similar...sorta" W-G HD-7674P, with UHF Beamwidth of 61-deg on Ch14, 54-deg on Ch33 and 46-deg on Ch50:
Actually UHF (front) part of HBU-33 looks more like CM-3018, but I couldn't find any specs...but from fol. Azimuthal Pattern Charts, it's a LESS than 50-deg over most of the NEW UHF Band:
OTOH, 2-Bay Bowtie with Reflector like above Eagle (and old DB-2) provide 60 to 50-deg Beamwidth across UHF Band...which makes it the BEST CHOICE from a Beamwidth point of view.
BUT, once you point towards your weakest station, the strong ones are going to come in no matter WHICH direction they come in on, cuz Gain is significant in ALL directions, as shown the fol. EXAMPLE Old DB-2 (Eagle may have better performance...but like many other mfrs, NO SPECS):