For flying straight up? Assuming your controller is laying flat, the antennas would point straight out, flats facing up. The majority of the RF radiation comes from the flat sides of the antennas. The flats should always be facing your Phantom when you are any real distance away. As in the manual, if they are pointed up when flying away from you, angle them out in a V shape - the slight polarity difference helps account for tilting and movement in the Phantoms antennas in its legs - there is 20-30 dB of isolation between horizontal and vertical polarity, so splitting the difference helps as the Phantom is always moving anyway.