Thats why you see the comms guy pull out his tacsat antenna and point it where needed out in the field.
A popular antenna is the Dorne & Margolin DMC-120 which offers 6db of gain
My portable version offers similar gain and robustness, however it is not easily field packable. I magnetic mobile mount is still on the drawing board.
Either antenna is ideal for the Motorola LST-5B lightweight satellite terminal