i pick up all the toronto and hamilton and buffalo dtv channels at bathurst and bloor area here using an old school winegard vhf uhf brand antenna and recently took it down cleaned it up and installed new 300 ohm to 75ohm matching transformer and new RG6 cable no preamp.
it sounds like yours need a once over for sure,how do you pass uhf? with the channel 5-9 and fm traps? uhf-dtv losses are very high with those inline.