I do not think so. They will act as an array, but each helix has its own lobe of radiation.
stacking antennas results in a doubling of the antenna area in the simplest case, thus also a gain of 3 dB. The distance between the antennas is chosen so that the 3 dB opening angle in the radiation pattern does not disturb anymore.
As long as the signals are sent on their way in parallel, you will receive a correspondingly focuised 3 dB profit at the receiver.
But, sent over a parabolic shaped reflector the lobes go apart and sprinkle ....
For a common focus of the array on a parabolic reflector I lack the physical justification, but I like to learn ... (stacking 4 LNB´s and gain rise up 6dB ? )