Having two antennas is therefore especially useful for moving transceivers (laptops, phones, etc.) or for transceivers that need to talk to many others at the same time (the router). Then, again, make sure that your router is in the x or y direction, but not in z. In that case you want to position the antennas in one line, so that you're improving both x and y, but not z.
Newer cards will use both antennas at the same time. However, the card will normally not use both antennas at the same time, but rather select the one with the best reception, so you will have equal reception in all directions. That means you have fair reception in the z and y direction, and good reception in the x axis. You can do that on both sides: on your computer, and on your router.Īdding a second antenna in a 90 degrees corner with the first one would mean that you're going to improve reception in, say, z and x axis. To improve your reception you can position the antenna differently. That means, if your router is in the z direction, you're going to have poor reception. You can see that radiation is high in the x and y direction, but poor in the z direction. This is the kind of radiation pattern you have with one antenna:
Have a look at page 7, where the radiation pattern of a dipole is shown.
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