What is a “director” (when you’re talking about antennas)

Ever wonder why antennas look like this? There’s a lot of science involved in antenna design, and while the whole thing is technically considered an antenna, the part that actually receives the signal is usually a small X-shaped or looped section somewhere in the middle. In the photo above, you might be able to see it right behind the orange plastic portion in the middle.

The rest of the antenna’s just there to make that little part work better. You might remember that the angled parts on the back are reflectors, which aim signal at the back side of the receiving element so you get twice as much receiving area. Now it’s time to talk about the directors, which are the things sticking out in front. You’ve probably seen these for years, as part of old-school antennas:

On this photo, the directors are the part at upper left that kind of look like the blades of a hedge trimmer.

Directors act like a lens helping the signal go where it is supposed to. If you think they don’t look much like a lens, you’re right there, but that’s how they act. The precise location of the horizontal bars actually re-radiate the signal strongly in one direction and cancel it out in other directions. There’s a good reason to do that…

…actually there are two good reasons. First of all you’re basically pushing more signal where you need it and less signal where you don’t. Second, you’re focusing the signals you really want and rejecting the signals you really don’t. In the photo at the top of the article, you’ll see three sets of directors sticking out of the front. The top one is longer because it helps focus signals that are coming from a lower angle. In most parts of the country signals cannot bounce effectively off the sky (in smoggy Southern California they do actually do this) so it’s more helpful to catch bounces off the ground instead.

By rejecting signals that the antenna doesn’t want, there’s an added benefit. In Televes’ patented design, the directors help keep LTE transmissions out. LTE signals, used for cell phones, can be a lot stronger than distant antenna signals and can overwhelm an antenna. Televes antennas use several levels of filtering to make sure LTE signals don’t get through.

If you’d like to get an antenna with the best possible directors, check out Televes antennas today.