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You don't specifically mention whether you are using an internal or external antenna. The fact you mention a masthead amp, suggests the latter.
TVI is generally via air or mains-borne paths. If it's mains-borne, then a line filter may help. If it's air-borne, then if the masthead amp (I agree with bojan here - I don't think it will help, either) or more directional antenna doesn't help, try changing the antenna position and/or height.
Ground reflections, or reflections off various objects (moving or static) may cause phase cancellation - changing the antenna position/height might reduce or elliminate this (it may also make it worse!).
Do you live in the vacinity of an airport, or flight path?
Good luck!
Cheers
John
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