Do a double scan of the tuners of all TVs. Also, check the coaxial cable. Use only RG-6 or better feedline. Check your splitter. I am listing several things because we don't have enough information about your set-up to narrow it down any further.
The other question that needs to be asked is, are both TVs digital? An analog TV would only pick up legacy low power and translator stations. The way to fix that would be to purchase a converter box, or a new TV.
Coaxial cable is the round wire that connects your tv to the converter box and the box to your antenna. Coax uses 'F' fittings that have a central wire with can be delicate. There is a slight possibility that wire is bent sideways inside one of the fittings, and that would cause one TV to be unable to receive any (or few) channels.
TVA on Canada is A Quebec channel over air, maybe the sensibility of Turner can vary, or your splitter is causing signal loss I had a similar problem and could solve it by use a splitter for dish maybe you need to try with a Splitter of 2.3 GHz to get sure that are getting all the signal stream to your televisions
one time happened when i splitted my antenna signal to two televisions that the kitchen converter box the channel 30UHF just could not watch it when i turned other television, the signals goes in 0 and the other television had perfect reception, and that time used an splitter of 1GHZ that seem to have too much attenuation in one line so i used an truspec of 2.3GJHZ splitter for Dish and the problem got solved, when you split the signal in two both televisions or converter boxes have to get the same stremnght, in ATSC is right can work with lower signal intensity but already if the converter box turner have an noise floor too low the incoming signal of an conventional 900MHZ splitter can be too weak for even make that the converter box pick a tv channel in digital (Numerique) so check up your converter box, also check by any thing ie amplifier or booster that can be making the signal weak or making too much attenuation that includes coaxials cabls of bad quality or with a poor shield
One time it happened when I split my antenna signal to two televisions that the kitchen converter box for channel 30, UHF. I could not watch it when I turned to the other television: the signals goes to 0 and the other television had perfect reception. At that time I used an splitter of 1GHZ that seem to have too much attenuation in one line so i used an truspec of 2.3GHZ splitter for Dish and the problem was resolved ...
Great post and a wake-up call for all viewers and especially OTA experimenters. You are suggesting not all components you can buy for your system actually do what they claim to do. Imagine that! We should start a thread here about brand new junk, and name those items.