Antenna directed includes lowest point (5)
I believe the answer is:
nadir
'lowest point' is the definition.
(I've seen this in another clue)
'antenna directed includes' is the wordplay.
'includes' indicates a hidden word.
'NADIR' can be found hidden inside 'antenna directed'.
(Other definitions for nadir that I've seen before include "Rock bottom" , "It's the depths" , "deep despair" , "pits" , "extremely low position" .)