Industrial wireless antennas come in a very wide varity of shapes, colors and designs. Diretional antennas need to be pointed at eachother in order to opperate. Omni-Directional antennas still need to be used in a way that allows for the largest amount of "gain" or signal that is transmitted or recieved.
Typically long range directional antennas have a very narrow beamwidth and need to be alligned very carefully. In addition to direction it is important to account for changes in elevation. The best analogy is to think of the antenna beam like the beam of a flashlight. If you going to see the flashlight from a long way away, you will need to point it direct at your target.