Now you can build your cantenna with just one tin but chances are you wont meet the suggested overall minimum 3/4 wave length required when using the centenna calculator
. So first thing to do is go to the cantenna calculator
and enter the diameter of the opening of your can in mm. You will see the overall length on the can down the bottom, if your single can is too short then you will need to use two, Don’t worry if you a little over or under length but it should be fairly close.
Alright then what we want to do is remove the top of one can and the bottom of the other. Once you have done this on the can with the top removed cut out a small strip approx 10mm across and 15mm down the can. Then we are going to use this slit so we can push one can inside the other, The can with the slit will deform slightly but don’t worry about it at this point.