[ICOM] Receive antenna input?

[AD5VJ Bob]

I have an IC-775. 

In the operators manual on page 11 number 2 it talks about the back panel of the radio.
Number 2 is talking about the 
"Receive Antenna Jacks" [RX ANT IN]/[RX ANT OUT]

It says:
"Located between the transmit/receive switching  circuit and receiver's RF stage. Connect an external preamp or RF filter, if
desired."

That is all that is mentioned about this back panel item.

Question is can I connect an external receive only antenna to this point (a loop for 160) and if so does anyone know how?

  73 fer nw,
Bob AD5VJ(AAR6VM)
http://www.ad5vj.com/

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