[Al Skierkiewicz]

Jeff,
The SA7 was the one I was thinking of and it's pretty cheap. You might want to shield it in a metal box but I don't think that should be a problem. There is no need for a demod since the signals you are looking for are not modulated on an RF carrier. They are just baseband radiation. By using a video monitor that is locked to the same sync as the monitor you are snooping makes it very easy to "sync' the signal you are looking for. The preamp raises it to a level that can be displayed on the second monitor. Remember that the antenna you use effects the overall gain of the system. The higher the gain the more likely you can overdrive the preamp. You need to get at least 0.5 volts of video out of the preamp for the monitor to display something. Anything over 0.8 volts will wash out to pure white do to overdriving the input video amp. An oscilloscope would be a big help to see if you are getting any signal through the preamp and at what level.