Chesapeake & Midlantic | 03/10/14 06:32pm
Depends. Do you mean 1) a bubble fifty feet across, 2) fifty feet in every direction, or 3) a spot fifty feet away?
It is firty feet in front of mic, 180 degrees in front of mic
IPVMU Certified | 03/10/14 09:16pm
I cannot find something covert and long range in an off-the-shelf product, so I'm curious too.
How about a "nearby" covert mic (like, in or on the shack) with some form of wireless transmission back to the camera?
Unfortuntely the only mics I'm aware of that will do what you want - pick up audio specifically from a point 50' away without massive background noise - tend to be shotgun or parabolic reflector types, neither of which is anywhere in the same universe as "covert".
Covert is a misleading word. Well ... Most anything can be hidden in plain sight. An 'optical delusion' works. Been to Disney land? :-)
Even the parabolic and shot gun units. Might start with an oogler search |DYI snooper microphone| then select images from the tool bar on the presentation page. A whole bunch! Yep a few 'make your own'. All this with out some information to show the guard shack, FOV, or focus point of sound.
Workings? The right shotgun mic (size, count and length) of tubes married to a suitable microphone for the job. The placement? Again hidden in plain sight? Should get results. Hidden may be under a false ceiling of the guard shack. Pointing through a mesh, slats etc. on the face of the guard shack. There is a solution out there.
Having said that. I like Matt's. wireless (or even buried) solution.