Has it Every worked properly in the past without being fuzzy (as long as you have had it).
Did it work properly in the past at its current location?
If it worked correctly in the past, but not in its current location, the last answer I have is to Change its location.
It may be getting interferrence from another appliance nearby or in the wall.
You may be able to hook it up to a surge supressor with line filtering and "have joy"..
You might take it OUTSIDE of the building and try it there (still using the Speaker wire ant). (headphones are OK, speakers do not need to be outside unless it is a pool party).
If it WORKS Outside but Not inside, then it is STILL an antenna or location problem.
If the problem Improves AT ALL outside, then it is still an antenna or location problem.
If the problem does not improve outside, it is most likely an internal problem.
Note; (try MANY stations, not just a few).