The second problem has been bugging me for over 10 years. The west side of my home does not get clear AM due to nearby factory(loud annoying buzz/hum). Read somewhere that I can filter the guilty frequency out. Last question I have is there a way to cheaply find this offending frequency and filter it out?
You may likely need access to their machinery which would hardly seem worth while.
Noise is usually suppressed at the source.
You could of course approach any government body who might investigate any "unlawful" rf noise.