https://www.youtube.com/watch?v=oRzJE3LAxDk …This does not look right to me. I think the advice
from Bonito to place the isolator very near the radio
is not a good idea. If you want to eliminate all
interference completely I suggest you look at these 4
1) http://www.youtube.com/embed/ItLkn8r4s3E (24 min)
2) http://www.youtube.com/embed/zsZTX7MQSGQ (47 min)
3) http://www.youtube.com/embed/kgMbaJDFu9M (55 min)
4) http://www.youtube.com/embed/C65u7Pmz7a0 (21 min)
At the end of #2 you can see how interference suppression
is much better with the isolator at some distance from
the radio. The mechanism is that the cable from the
antenna to the isolator has a very high impedance
at the point where it ends (for common mode) in the
isolator. It is extremely sensitive to electric fields.
Put the isolator halfway between antenna and rx. It is good
if you supply a ground point on the screen towards the
antenna at the isolator - but leave the screen towards the
radio ungrounded. It should be grounded at the radio.
For grounding you might use half a square meter of
sheet metal lying on the ground (you can see in the video
that the whip antenna is grounded that way.) You might also
stick some kind of metal rod into the ground.
The video should explain if you have the patience to see
all of it.