Create a cantenna to drastically extend your Wi-Fi signal! Works great with a router that has external atennas, like the old-school classic WRT54G.

Circular waveguide antenna calculator - JavaScript instructions and Plans to build a cantenna array with 4 cantenna's for extreme gain. WiFi Video Tutorials Here.

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Requirements For This Walkthrough Materials • A with external, removable antennas, preferably with custom firmware or a • Mac or PC • Empty or other •, chassis-mount • for connecting to most routers (a.k.a. Thank you for this guide and for continuing to respond to comments. I have a can which has a lip which comes 1/4″ in from the outer diameter of of the can all the way around. If I use the inner diameter I get a measurement that, according to the calculator, won’t work well at all. However, if I use the outer diameter measurement then my can is well within an acceptable range. How much will this lip affect the entry of radio waves into the can?

Which measurement should I use, or should I use a different can? Thanks again. You’re welcome. I have always found the cantenna (and other projects on my blog) long-term fun, so it’s always interesting to keep up with users that interact with me long after the post has been published. If you think of the radio waves like waves in the ocean, it may better help understand how the lip of the can may affect the signal. From what you are describing, the lip sounds like it the waves will enter the can, but will get distorted a bit from the lip.

If you were to send a water wave into that can, the wave would grow or distort when it hit that bump in the can and may not be the correct “height” when it reaches the back of the can and hits your element. Take that information as you will. In my example, the can has several ridges, so it’s not perfect to begin with. A smooth, shiny surface works best for a cantenna, but this limits your options and I had a hard time finding one that was perfectly smooth and shiny inside. That being said, of the two different cans I tried–the pineapple juice one and the formula one–the results were similar but not exactly the same. I hope this helps a bit.

Could you greatly extend the capabilities of a cantenna by fixing it to the focal point of a parabolic reflector (old satellite tv dish) facing the reflector? Theoretically this should work but I haven’t seen anyone do this. Also I’m still a little confused at what the optimal diameter of the can should be.

In your picture is says half the wavelength but in other posts I see about 3.5 in is best. According to you it would be half the wavelength of about 2.4 in (complete coincidence that its for 2.4Ghz). This is very cool. Think I am going to try and build two of these. But I cannot find any tutorials on the setup. Is the WRT54G router still capable of acting as a local access point with its second antenna while utilizing the long range directional antenna? Its simple enough to put it in some repeater bridge mode thing to have it connect to a far distant antenna with the directional can.

But then from what I understand it only has the ability to use one antenna at a time so is it smart/powerful to switch back and forth multitasking two separate networks? Or how is the router used now that you have connected it (to a source of internet, presumably) in the far distance.