Considering the information given by the beasty, height above ground coupled with the fact that the aircraft can have all sorts of pitch and bank angles, a 60 degree "cone" in bank and 30 degree "cone" in pitch would fit the bill nicely.
PM
(Standard jet departure with 18 degrees pitch up and a 30 degree banked turn starting at maybe 500' - the RadAlt must be able to cope with that!)