Here is somebody that uses a receiver to get the signal instead of rods.
You can see the receiver on the left handside of the page.
http://www.thortech.org/en/
Mind you sometimes their webpage doesn't open at all.If you are lucky sometime you will go further and be able to open the page under the heading <Instruments> on the left again.There they explain how their Rx works and they are saying that you will be able to go straight on target.
They give specs for both Tx and Rx.
Once we went out treasure hunting with somebody that had a similar device over here in Greece.He told me that it was a cheaper patent of the equipment that thotech make.I was surprised to see that it was working and that was the first time in my life that we found something using an LRL.