Its from Advance Receiver Research
http://www.advancedreceiver.com/
It has to be a custom model. Its similar to P470VDG or P902VDG.
You just order a different center frequency. Price is $90 to $130.
Specs (at about ch 39)
NF 0.6 dB
Gain 18 dB
1 dB Comp dBm +12
1 dB BW 30 MHz
Type: GaAsFET
Power: 10-16 VDC
Mine's ordered for Ch. 44 so depending on how
it was tuned it is likely a little bit down in gain at Ch. 39.
For indoor use there are no cons except need for a wallwart. Outdoors,
it needs weather protection and power sent to it.
Doug