So let's look at some do-it-yourself projects in the field of antennas. And we'll look at the probably most famous one, the cantana. Then a very interesting one, the bi-quad, and a collinear omnidirectional antenna. The container um was one of the earliest do-it-yourself antennas rob flickinger built the first about 20 years ago now july 2001 this video made july 2021 uh rob flickenger made a pringles can antenna which isn't the optimal size really but it was the first very famous uh it was a fun antenna and people liked it for that reason the cost of making a container it's three four five dollars something like that you'll need an empty can of the right size you need the connector typically an n connector and you need a bit of cable that's the two parts that actually cost money the can you could typically find for free and mentioning rob flickinger here this is myself with marco zanara of the ictp and rob flickinger and we are shopping for oil cans it was actually so in this case we wanted this specific size uh about eight to ten centimeter diameter and pretty longish antennas we had arranged with a container of that place to take the oil that we'd be buying because we wouldn't really know what to do with 50 liters of cooking oil but the container could use it so we shopped for these we got the cans the container got the oil and we used these for the workshop what can you expect from a antenna like this you'll get something like 10 dbis of performance a relatively wide but directional beam 60 degrees opening angle something like that and if you're a little bit trained in doing that maybe not on your first one but then one to two hours of building time possibly the instructions for this type as many other types one option is the the green book wireless networking and the developing world but there are many many other guides we also made one which is available as a video and we're showing you the link here that is a step-by-step walk through making a container like this from choosing the right can to all the drilling and dimensioning placing of elements and so forth the next one we have here is the bi-quad antenna what this is is two elements square elements uh positioned in front of a back plate a grounded back plate the cost is somewhat the same and again it's it's the connector and the cable that will cost you money the rest is time is spending the performance of this antenna is in the same league as the container 10 dbi something like this here's an example where we build these types of containers into a box together with a an old linksys ap the one that i just showed you here soldered together and then deployed in a mesh network actually you see a combination here of an omnidirectional and a directional patch antenna built into one box used for a 13-15 node mesh deployment over a whole town city in in san garima. The last of the antennas I'll show you is the co-linear antenna. This is a way of building an omnidirectional antenna from two of four elements you get five seven dpis maybe a bit my personal opinion i've never been a huge fan of building these because they're quite difficult to get precise enough and the moment you're working not precise enough they won't perform very well the omnidirectional antenna is one where i personally would say rather buy one they're relatively cheap than making your own but if you have the precision you have the time and you have the ambition to do it they're absolutely possible to build.

© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon.

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