It might be useful to look at data regarding the frequencies of EM
emissions from unusual aircraft. The following document exists.
I don't have the document, or any other information about it.
Maybe someone has it, or knows a way to get it.

"Summary of Signature and Statistical Data RF, Unidentified Objects Observed During ICBM Missions"

, by C.R. Berndston, MIT Lincoln
Laboratories, Contract # F19628-73-C-0002

There is some sketchy information about EM emissions in the Handbook
of Ufology, pages 106-109. Two cases are described:

The first case is a UFO sighted by an Air Force B-47 over the Gulf
of Mexico in 1957, and documented in the Condon Report. The UFO was
reported by the pilot to be as "big as a barn" with a "steady red glow",
flying at "speeds far greater than an airplane". The object emitted
electromagnetic radiation at a frequency of about 2800 MHz with
"startling intensity".

The second case is a UFO encountered by a military aircraft equipped
for electronic countermeasure missions. A detailed report was made at
the 136th Meeting of the American Association of the Advancement of
Science in Boston in December 1969. An official report by the Wing
Intelligence Officer at Forbes AFB in reference to the UFO said:

... intercepted at approximately Meridian Mississippi, a signal
with the following characteristics: frequency 2995 MHz to 3000
MHz; pulse width of 2.0 microseconds; pulse repitition frequency
of 600 Hz; sweep rate of 4 rpm, vertical polarity ... Signal moved
rapidly up the DF scope indicating a rapidly moving signal source;
i.e. an airborne source ...

Paul Hill, in his book "Unconventional Flying Objects: a Scientific
Analysis", does not provide any information about frequencies of
EM emissions. He does provide a variety of anecdotal evidence
relating to heat emissions, glowing colors, and radiation poisoning
experienced by human observers. UFOs are variously also reported
to emit an audible humming noise -- such as you might experience
with the above craft utilizing a high energy pulse repetition rate
of 600 Hz.

There is also an interesting article published by the AIAA, which was
presented at the 47th International Astronautical Congress, October
7-11, 1996 in Beijing. IAF Paper No. IAA-96-IAA.4.1.07, "An Electromagnetic
Rocket Hyper-Light Stellar Drive", by Paul Murad, Aerospace Engineer
and Senior Member AIAA, affiliated with the DOD.

The first paragraph of the abstract reads: "Virtues of electromagnetic
propulsion are examined in light of recent data published about unusual
aircraft." Murad discusses a variety of eye witness reports, and
photographs of UFO sightings, and provides an overview of theories of
possible EM propulsion techniques.

Regards,
Robert Stirniman
----------