I don't know how to reply to your answer since you think you know it all.
Not all of television migrated to UHF.
Many signals such as FOX that was delegated to the UHF when first established because the VHF was full, sold their frequency allocation to the larger stations and migrated to the VHF where the cost of running the transmitter was more economical.
In retrospect those signals were probably better off, due to the fact that the government is going to take away another 100 or 200 MHz of the television band for public service and cell phones in the near future.
When that happens, the broadcasters above channel 36 - transmit frequency will be SOL.
In some markets the band plan is already full in the lower frequencies and with a one channel guard there is no room to migrate.
In the near future, you will see more and more stations migrate back to the VHF.
IT DOES NOT MATTER IF IT IS DIGITAL OR ANALOG, IF YOU GET THE TRANSMIT ANTENNA NEAR THE RECEIVE ANTENNA IT WILL CAUSE OVERLOAD WHICH WILL STILL CAUSE TVI.
Most people have migrated to Cable service, which is the reason why you do not hear as many TVI complaints.