The 4:1 transformer balun works well for VHF & UHF; the PCB balun works better for UHF than for VHF. The new UHF antennas with a built-in PCB balun don't pick up VHF channels as well as the older UHF antennas that used a separate 4:1 transformer balun.
So, it really depends upon your application.
If you need a low-loss balun for one channel, then the best choice is a DIY halfwave 4:1 coaxial balun cut for the frequency of that channel.
http://www.hdtvprimer.com/antennas/temporarypage.html
http://www.digitalhome.ca/forum/show...&postcount=761
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Awhile back, ADTech said that NEWER 91XG used a Printed Circuit Board (PCB) balun which uses unequal stripline delays to form the equivalent of a Coax Balun, which ONLY works on UHF Band and severely attenuates Hi-VHF. You probably could figure out a way to replace the PCB Balun....perhaps ADTech can help...
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http://www.digitalhome.ca/forum/show...10&postcount=3
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DB4e and DB8e use PCB (Printed Circuit Board) Baluns, which are VERY lossy in Hi-VHF Band, which is something NOT modeled by 4nec2:
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