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Filters Filters Oh My!!???? Now I see RTL-SDR is selling AM Broadcast Notch Filters on Amazon. Can anyone here input comments on what they help ? I already asked Dale at Parelectronics and got a swift accurate reply...He said the AM stuff overloads the 120M and 80M Ham bands. So is this a good thing to add to a very sensitive front end GRE scanner? Don't guess I ordered one for testing and will post results soon. I am inviting comments and opinions here. Please post??