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Don't know what term antenna you have or if it is possibly the trouble but you can try another antenna
A length of wire or a set of UNamplified rabbit ears etc
Any interference broad enough to wipe out vhf and UHF at the same time is rare so I suspect one very strong signal very close to your location is driving your tuner into AGC overload
You can use am radio to listen for electrical noise like what is created by motors, arcing insulators, etc
Just tune it to an under portion of the band and listen for buzzing noise that is so strong that it covers up local broadcast stations
If you can get your hands on a police scanner, you can make it search between say 140 MHz to 174 MHz looking for any signals that sound perfect with no antenna on the scanner
Also scan from 400mhz to 470 MHz doing the same
If you know anybody around the area that might have an old analog tv field strength meter, they could easily and quickly prove interference
Local TV antenna installers may have on or a local ham radio operator will usually have such equipment
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