Hi Brando82501,
Welcome to the forum!
There's definitely merit to considering possibly needing two DVRs, but I'd like to suggest that you not put the cart before the horse. Rather, you should get squared away with the antenna solution first, and see how it does feeding into a single recorder before you spend the money on a second one.
Have you considered the ClearStream 4 or 4V models from Antennas Direct? I like them better than the newer ClearStream 4 MAX, for two reasons: These older models include the reflectors (that look like chicken wire), and if you get the V style (or separately purchase the Antennas Direct VHF Add-On...it's what's included to get from the 4 to 4V), you can zip tie the VHF dipole element to your mast to be facing in a different direction.
This is my rabbitears.info report:
RabbitEars.Info
I have a ClearStream 4 in place to receive my UHF stations. It points at approximately 195 degrees True, through tall hardwood trees, and has me locking in both RF26 WCMU-TV PBS from 14 degrees (estimated at 67 dBuV/m) and RF15 WXSP-CD MyNetTV at 251 degrees (estimated at 64 dBuV/m)--and all UHF signals listed above on the report. I used to use the V element to get my High-VHF stations, through RF11 WGVU-TV, but then the OTA bug struck me and I wanted to attempt to receive both RF9 WWTV and RF10 WILX--so I've since upgraded my VHF antenna to being an RCA ANT3037 pointed straight onto RF10 WILX. Separate UHF and VHF antennas can be combined into a single downlead RG6 coax from the roof by using a UVSJ = UHF-VHF Signal Joiner. Antennas Direct and Radio Shack sell them online...avoid the Stellar Labs option, as it has more loss than the others per testing by one or more members of this forum.
I'm guessing you'll not find antennas locally. I'll offer the suggestion that you check that big online site that will sell you everything for their open-box deals on the ClearStream 4, ClearStream 4V, and Antennas Direct VHF Add-on. When I looked just now, there's a really good deal on a "warehouse" ClearStream 4, such that it's most economical to purchase it and the VHF Add-on separately.
Once you have them, try first pointing the ClearStream 4 in both of the directions, and see which way the reflectors help the most with the UHF signals (the ones not with the yellow background on your report). Then see if the VHF dipole works out when clicked to the reflector, or if better when zip-tied to the mast and pointing a bit differently. Worst case, if the single dipole isn't enough, the my next thought would be to order up a UVSJ and likely a RCA ANT751 will be sufficient enough for the 3 VHF stations, since they're relatively strong.
That's my two cents on how to incrementally approach your situation, and my experience with the bi-directional attributes of the ClearStream 4.
Cheers! ~~ Statmanmi