These terms refer to the signal being sent from the transmitter antenna. A directionalantenna will transmit only in the direction it is facing with approximately a 15-35 degree conical signal dependingon the gain of the antenna. The higher gain antennas usually have a more narrow signal pattern. Omni antennasare usually less gain and therefore will not transmit as far as directional antennas. Their advantage is that theirsignal is sent in all directions at once.
Directional antennas are best suited for stationary point to point applications.
When selecting a camera, one should always check to see what Lux rating the camera operates on. The lower the Lux rating, the lower the amount of light is required to capture what the camera is seeing.