Based on this Diagram I thought it was possible. So, what am I missing?
How do I get an RX Out from the Flex 6700?
I could have misunderstood the question, but I thought Al had the answer. The signal from ANT1 or ANT2 goes to the SCU by the user completing the loop between RXA OUT and RXA IN (in this case inserting a splitter between RXA OUT and RXA IN to feed an external receiver). The block diagram leaves something to the imagination, I agree. I would also add a front end protector, such as an Array Solutions AS-RXFEP, for the external receiver.
BTW, the DXE RTR-1A antenna interface suggested by Steven is a very versatile product. I use it also. Among many other uses, it lets you very quickly compare signals and select your TX or RX antenna(s) for Rx at the flip of a switch. Much faster than selecting from menus. The DXE user manual is available on their web site and includes many detailed diagrams on possible uses for the switch.