I have a friend that has a noise problem with his Galaxy DX99V. Sometimes his S-meter will jump up to 20 and stay there for a couple of hours. Sometimes it stays much longer. I went over to his house to help him try and solve the problem. He is a professional electrician by trade. We both came to the conclusion that the power wires that ran by his house had to be the cause.
So, I got in my car and drove around his neighborhood to see if the noise went away on my mobile radio. I finally located the problem, as it turned out to be another power pole across the street from his house. If you drove 1/2 block away, the noise would go away. The noise was strongest when parked underneath the pole.
He called up PG&E and asked for a crew to check out the offending power pole. They did come out - and with radio equipment - verified out findings. The said that they would come out and fix it in a couple of weeks; but they never showed. So, my friend began to call them back and pestered them to do something about it. They called him back to say that they have scheduled a service/maintenance in the next three weeks - for sure. Seems that my friends neighbors that have wireless internet were also having problems and complaining.
The offending part of the power pole is a resistive joint on one of the insulators. They need to be cleaned from time to time and have any charred squirrel/bird bodies removed. It is surprising to see that so much current off of the poles was being converted to EMI by a bad connection. PG&E says this happens quite often, and maintenance crews don't always get caught up with their work.
You can do the same thing that my friend and I did. Get in your car and hook up a mobile radio. Or - if you have a friend that has one - then he can help. It really only took about ten minutes or less to diagnose where the noise is the worst. Once it is located, if you have a walkie-talkie, you can zero the location within ten yards. But any mobile radio will do, especially if you have an RF gain on it. Then, you are ready to call up the power company and insist for them to fix the pole. You have every right to let them know; they often don't act unless there is a complaint. And if you have a wireless system in your house - or your neighbor does - that is even better ammo to use when making your complaint known.
All kinds of things can create EMI. Rather than blame the radio; are you sure it isn't EMI that is affecting it? What happens when you get in a vehicle that is equipped with a radio - does the problem fade away? I'm not saying this is your problem in particular, but it might be. I don't have any problem with the power pole near my house - except when air conditioners come on!