Location of radar altimeter antenna?

[ShuRugal]

I am curious to know where in the aircraft the radar altimeter antenna is located. This information would be useful when making precision touchdowns, so that I may accurately estimate the actual height of the wheels from the ground at various approach angles, or to estimate the height of the tail when conducting low-level wheels-up passes.

[DarkFire]

Good question. The closest information I could find was this cutaway diagram that's supposedly of the Su-37. No idea if it shows the radar altimeter as I don't read Russian.

 

 

That being said, usual placement for a radar altimeter on a fighter appears to be a patch antenna under the nose somewhere, so it would be worth subtracting ~1m from whatever the HUD reading says during level flight to compensate for the depth of the intakes.