Look at this photo...

As an ex Radio Engineer, the larger aerial looks similar to a UHF comms aerial, the smaller possibly IFF.

Navigiation aerials are usually fitted as pairs side by side each other.
 
Fnerg:

Remembering back when I used to own / work on planes, the smaller antenna is a "Transponder" antenna and the larger one looks like a "com" blade. Usually (at least when I dealt with them) a Nav antenna is in the tail of the plane..

Hope this helps..

Bill
 
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