What you have is commonly refered to as "road noise". Look it up at Crutchfield.com or other sources. It is common to produce things like this in various audio systems. Is there an easy cure? No unfortunately.
My advice would be to check and see if the radio is grounded through the same source or wire as the factory wiring harness, try grouning it to another solid ground source with a longer wire (somewhere that already has a ground connected under the dash) and if all else fails, try running a wire straight to the negative post on the battery. The last is never really practical or desireable but usually works as a fail safe.
If you still have problems with this, post up more questions and what you did and we'll work it out. Sorry for the slow response time. NissanTech has been having internet problems and I'm on vacation right now. By the way, working at poolside and connected wireless is the only way to go!
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