What you would probably want is a Navy EP-3E ARIES... based on the P3-Orion.
www.globalsecurity.org/intell/systems/ep-3.htm
EP-3Es detect, interpret and report tactically significant communication and radar signals. With sensitive receivers and high-gain dish antennas, the EP-3E can exploit a wide range of electronic emissions from deep within enemy territory.
Transceiver Range has been discussed and has been determined to be not as important as other factors:
www.backcountryaccess.com/english/resear...s_NextGeneration.pdf
[size=10pt].....Receive range could very well be an
anachronistic product attribute with the changing
demographics of the modern transceiver marketplace.
The demand for increased receive range
was originally stimulated by Swiss search and rescue
teams. For this application, in which there is
usually no "last seen point," longer range is valuable
in identifying or ruling out terrain features to
be searched. These operations are almost exclusively
body searches: nearly 100 percent of completely
buried avalanche survivors are rescued by
members of their own party (Brugger et. al., 1997).
In this case, search speed is not of great importance,
except perhaps to minimize the exposure of
the rescuing party. But in today's market, comprised
primarily of recreationalists, searchers are
more likely to be members of the victim's own
group seeking to make a live recovery. In this case,
search speed and ease of use in a panic situation
are of ultimate importance—not range.[/size]
