[Milsurplus] Radio interference

[POWERMWT at aol.com]

I have problem with radio interference with my TCS radio in the back of my 
1944 MB-NAVY-MZ-1 radio jeep.

It has a 6 piece sheet metal suppression system that covers the ignition 
wires & plugs, coil and distributor, as well as filters (capacitors) for the coil, 
ignition switch, starter switch, generators (2) and regulators (2). 

When the engine is running at the 900-1000 RPM required for keeping the 
batteries charged, the static is too much to hear anything (like 1530 talk radio). 
Yet, with the engine off, the reception is excellent. This leads me to believe 
I have some sort of interference with the ignition system. 

I have an old article on how to make a 4" diameter loop probe connected to 
the antenna and ground to locate the interference by listening with the 
headphones. 

Is this the best method to find the interference? 

Regards,
Mark Tombleson