A common matching transformer / balun is a broadband transformer with no intentional filtering capability.
As I said before,
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KNTV is on VHF 12 but is probably doing OK, in part due to higher signal level and the frequency is higher, closer to the UHF band the DB-4 is optimized to cover.
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You can substitute CM4221 for DB4 in my statement if you like.
Integral baluns on some antennas are strip-line circuits that are a bit more frequency selective. My Antennas Direct unit uses that design, still it provides a fair signal on 9 and 11 here in Seattle. (That's with 60 dB NM's though)
There is more to reliable reception than signal level. High VSWR (poor return loos) will cause signal to reflect backward in the coax, causing multipath interference symptoms. Using a UHF only antenna to receive a VHF signal guaranties high VSWR. The directional quality of the antenna is also going to be different as the frequency goes away from the design center.