If Jeremy Clarkson did WiFi, he’d stick a 15db Omni antenna on the most powerful HotSpot he could find, and hope that brute force wins. It may do when dealing with engines, but not always so with radio waves – after all, there’s no point being able to see a HotSpot from half a mile away, if your laptop does not have the power to send a signal back.
A high powered Omni focuses the power into a thin disc that spreads out from the antenna. The higher the gain, the thinner the disc, and it’s possible for the signal to go right over the area you wish to cover, without actually providing any coverage. It’s all to do with the mystical Fresnel zones and where your receiver is placed within them.
Of course, there are times when a high gain antenna should be used – when creating a backhaul network for our rural installs we usually use a 24db antenna to make sure we keep the signal focused and at full power over the distance (usually around 5-8 miles).
Every WiFi installation is different, and has unique challenges which is why you really should call in the experts - its not a job for your local I.T. guy.
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