I tried this test with 2 CZ's and would like for someone to try this test with 2 MXT's....I only have one MXT, so I can not do the test.
A friend had a dime at 8" in his test spot.
He Ground Ball. his CZ 5 and 8" coil, and started turning the Sens down, until he could just get a faint hit on the dime.
I turned on my CZ 5 with 8" coil, and when I got 75 feet from his CZ 5, he could no longer pick up the dime, there was No cross talk heard on the CZ's,
but when I got close to his unit, you could hear the cross talk, I don't remember how close I was.
When Tesoro made the X-2 Shadow, they made a his and hers unit, the Freq. was just enough different on, I think her unit, so they did not cross talk.
So, if you and your friend can not hear any cross talk at 20 feet, you still could be loosing depth.
Also, if you get the book, The MXT Edge by Jeff Foster, there is a lot of good info in his book.
There are several units that can not hunt under power lines, and some times it helps to turn down the Sens or Gain.
EMI bothers some units more than others.
I only use the 5.3 and the 3x6 coils and I hunt in town and have never had a problem with my MXT.
HH...BJ