I will suggest some ways to go about receiving the Tv stations/channels.
Here is the first way.
Research shows that these Tv stations are the same.
WDAZ-TV VHF channel 8 and WDAY-DT UHF channel 21 are the same programing , ABC and CW ,
http://en.wikipedia.org/wiki/WDAZ-TV.
KFME VHF channel 13 and KMDE UHF channel 25 are both the same PBS ,
http://en.wikipedia.org/wiki/KFME_(TV).
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With the omnidirectional antenna you list these Tv stations as received , all UHF channels ,
KXJB-DT UHF channel 38 , CBS.
KVLY-DT UHF channel 44 , NBC and This Tv.
WDAY-DT UHF channel 21 , ABC and CW.
KMDE-DT UHF channel 25 , PBS.
So that leaves 1 more channel to receive that is not received to complete the reception of the networks with out repeating any.
KJRR-DT VHF channel 7 , FOX.
That being the situation , the omnidirectional antenna can be left in place and a second antenna can be installed for the reception of KJRR-DT VHF channel 7 FOX.
Install a Winegard YA1713 VHF antenna with a Antennas Direct CPA-19 preamp , aimed at about 195 degree magnetic compass direction.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a , HFS-2D , 2 way splitter.
For 3 Tv's connected use a , HFS-3D , 3 way splitter.
Buy the HFS splitters at ,
http://www.hollandelectronics.com , or ,
http://www.solidsignal.com.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The 2 antenna systems , the omnidirectional antenna system and the YA1713 antenna system will not be connected together on to 1 coax. The 2 systems will be separate all the way to the location/s of the Tv/s. And the 2 separate systems will be connected to a Remote control A/B antenna switch at each Tv location.
http://www.mcmelectronics.com , #32-4425 , or ,
http://www.radioshack.com , #15-1968 .
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com.