The present channel/frequency/wavelength allotment for UHF TV broadcasting is shown in Post #18 of the OTA FAQ
. Simply put, today's UHF TV band consists of channels 14 through 51 (470MHz through 698MHz). By looking up the frequencies for your desired channels you can check on holl_ands chart in Post #2 on how each of those great antennas perform.
Having said that, in the near future it is likely that a UHF channel repack will occur. This means that the UHF TV band would be condensed to a smaller range of channels, and not necessarily starting at channel 14. At least we know that the repacked band will be within today's existing UHF band, so we can thankfully still make use of the great performance info used today.
As holl_ands has reminded me, there is still the likelihood of today's VHF-HI channels remaining in the new mix. He mentions that VHF-LO is also a possibility, although there is still talk in Washington, DC about expanding the FM Radio band into the VHF-LO TV band so there doesn't seem to be any clarity so far on using some or all of VHF-LO as part of a repack.
So, if your chosen DIY antenna has suitable performance for your needs across the entire UHF band you are already good-to-go for the long term.
On the other hand, if you require performance for an exact set of channels in your area for an antenna that must operate over the long term without change, please keep checking in on the latest news in the following thread to see what decisions the authorities in Canada and the USA may have worked out: Here comes the UHF Channel "Repack" for OTA