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If any of your radios have a tuning meter that is anything beyond a single light it can be good to note it's reading... If you were working with tube radios I'd tell you to attach a DMM to the AVC system and use AVC voltage as a measure of signal strength...Unfortunately I would not know how to point you to that in a SS radio with out a good schematic.
Where do you normally listen from? Home in a neighborhood perhaps? There are lots of 120VAC appliances that put hash into the air any place in the vicinity of power lines. Ever tune a local AM station in the car and have it drowned by static driving under power lines?...Well expand that noise zone several fold for weak DX hits. If you can escape the grid by a couple miles, you will get less noise. A long-wire antenna (75'-200') between trees will increase the signal to noise on weak stations greatly too.
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