Has anyone ever searched the US Patent office web site? I was poking around looking at the Valentine patents and if you you look at patent 5,151,701 you will see that M. Valentine has also pantented a 3 antena version. 1 front antena and two 120 degrees left and right of the front.
It also shows the unit having 4 arrows as opposed to the current front, side and rear. I wonder if this was the original intended design that never made it to market due to cost of manufacture, or was it patented for other reasons such as to keep competition from being allowed to use it.
These patents are very detailed along with drawings and diagrams. It also spells out in one of his patents how the bogey counter decides the threat level of each radar it detects.
I found it very interesting to see the amount of work, engineering, and design had been put into the V1 and all from a few Ohio guys.
Take a look at it and do a search on "AN/(valentine and (research))"