MFJ-1026 Noise Canceler
This thing really works! Technically speaking the MFJ-1026 uses a phased antenna array to eliminate unwanted noise, and to boost weak signals. I recommend getting a better receive antenna. I use a Yoyotenna Deluxe. You have to do a lot of knob twiddling, but when you find the sweet spot the noise will practically vanish. The noise reduction on your radio can handle the rest. Amazing!
Check out the MFJ-1026 Noise Canceler!