I appreciate the responses.
I am just a bit busy to take the time to wind up a loop myself. I was hoping to find something already built that I could tweak but I guess it isnt that difficult to find some parts kicking around the house and build it.
Question: I read that using double shielded or foiled coax works significantly better for nulling out noise. Anyone note this in their own experiences ? I own a MFJ 1026 signal enhancer and want to use the loop as a sense antenna to null out some nasty sign ballast noise on 160 meters.
You should use the loop as the receive antenna and use the transmit antenna as the noise source. The loop has deep nulls broadside. If you can and you probably can, aim that at the LHNG (Local Horrendous Noise Generator). Phase in enough of the the other antenna to quiet it down a bit more. I did that for years with an MFJ 1025 until I realized I was getting almost all of the benefit from the loop alone. I now use two loops each with its null aimed at the LHNG and the two phased to peak and null signals. I've upgraded to a DX Engineering NCC-1 phasing unit too.
Here's a recording of the two loops in action. The loops are a Wellbrook 1530 and a straight-from-the-ARRL Antenna Book Doug DeMaw tuned looped. The tuned loop works just as well as the Wellbrook and it cost nothing. But it is tuned. On the recording you'll hear Cliff, N6ZU, first received on the dipole then the loops peaked, then nulled (while I fooled around with the nulling) then peaked again, then back to the dipole. I think you'll hear why I like the loops and the NCC-1