In the May issue of CQ my eye caught an ad for an Ultrasonic Receiver Kit
(page 113):
http://www.midnightscience.com/ultrasonics.html
This appears to be essentially the entire receiver portion of the W1TRC
ultrasonic powerline noise detector that was in QST a few years back. I
built the W1TRC device and have found it useful for isolating power line
noise.
It seems to me that remoting the ultrasonic transducer (microphone) out of
this kit into the parabolic dish of the W1TRC design would give you an
complete ultrasonic detector.
You may want to check these out.
73 - Jim K8MR
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