My aunt had/has one of those. I remember having a hard time as a kid using it. 
Is the plane count down today? What’s going on?
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They make a special internet version so people can open a can of worms without injury 
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I used something like this in the Army. We got one in every ration pack.Simple and effective.
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so where does the “N” connector go …
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We are still assembling the antenna’s ground plane.
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So i’ve just built a spider that outperforms my cantenna slightly and the cantenna was already a bit better compared to the pcb antenna in the tube from china.
I can’t really check for directionality of the pcb antenna as i’m having my antennas under the roof right now and the worst problems i have are mountains in 40 degrees of sky, neighbours houses in 100 degrees of the sky which are the directions i would have best range regarding the hills in the area. Then to the north there is a very slight hill that is enough to limit my range to about 120 nm.
Oh well could be much worse.
Still dream about installing a raspi on a hill on one of the wind turbines there. Or on the local tv broadcast mast. Now THAT would be good reception. (BAD LTE noise though)
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To put the records straight, the comment “cutting edge technology” I posted with the tuna can antenna photo were originally made by @triggers when he saw this photo several years ago in Planefinder forum.
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- opener&bottle cap-in-one
- opener for bottle and for can
made in USSR
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The sleeve serves an additional purpose. That of a balun.
The closer the “sleeve” is to the feedline, the greater effect it has on impedance.
This applies only if the sleeve is mounted over the cable’s jacket, i.e not directly on the dielectric.
Explanaton here: VE3VDC Emergency 2 Meter Vertical Bazooka Antenna
Aint experimentin’ fun?
Yes, it is. I enjoyed it a lot, but for last almost a year did not do any experiment on DIY antennas.
The Cantenna is sleeved dipole’s wide-bodied version.
I have performed trial runs on 3 sizes of sleeve dia, and the performance improved substantially as the diameter was increased from 20mm to 54mm to 68mm. Best out of 3 was Cantenna with standard Pepsi can 68mm dia.
I have taken a break from testing stuff to deal with hurricanes and stuff. So I wonder whether the results on the cantenna/dipole/ducky balun air gap would be a lot different with poorly shielded coax.
eg high quality quad shield RG6 vs cheap as dirt RG59
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I am curious, since you said the largest of the three diameters had the best performance, what are your thoughts on trying something like a large coffee can?
Have you tested larger than 68mm?
Thanks!
The biggest difference there i.e specifically between those two types of cable is the fact that RG59
is quite a bit lossier than RG6. Having said that, The best antenna in the world will sound terrible with an inefficient feedline, but an average antenna will always outperform if it’s fed with top quality coax.
Ref: https://www.jpole-antenna.com/2013/01/12/what-type-of-feedline-coax-should-i-use-for-my-antenna/
Although his statement refers to a transmitter antenna, the law of reciprocity says that what works
for a given transmitter antenna also works for that same antenna operating in receive mode, and vice-versa.
This is one of those FWIW type of things, but since the term and antenna have been around since 2007,
it would appear the name Cantenna is commonly understood to mean one of these:
http://www.turnpoint.net/wireless/cantennahowto.html
A long time before that, it meant one of these:
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August 2014 - Cantenna Can Size Comparison 68mm dia vs 100mm dia
Image 1 of 3 -Setup
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Image 2 of 3 - VRS Range Plot - 68mm dia Pepsi Can
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Image 1 of 3 - VRS Range Plot - 100mm dia Coffee Can
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Name Cantenna was first used by a manufacturer since very long for load resistor, but this product has of late ceased to be manufactured and sold.
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Name Cantenna was re-used in 2007 by hobbyists for a waveguide type highly directional wifi antenna.
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Name Cantenna was again re-used in 2014 by me, a hobbyist, for a wide-bodied sleeved dipole / koaxialantenne for ADS-B, and contrary to highly directional WiFi cantenna, it is an omni-directional dipole antenna.
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It depends who is using name “Cantenna”
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The name Cantenna is understood as load resistor only by Ham/Amature Radio hobbyists.
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The name Cantenna is understood as WiFi directional antenna only by WiFi enthusiast.
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The name Cantenna is understood as an omnidirectional sleeved dipole antenna only by ADS-B hobbyists.
When I chose Cantenna for ADS-B sleeved dipole, I was NOT aware of its previous Amature Radio or WiFi use as I am neither an Amature Radio hobbyist, nor a WiFi hobbyist. How I derived name Cantenna is shown in this 2014 post #1490:
https://forum.flightradar24.com/threads/3831-best-antenna?p=55872&viewfull=1#post55872
.
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Or anyone else with a large amount of RF to sink and a tight budget.
Speak for yourself.
This is my “cantenna” directional waveguide antenna for 1090MHz. I think it’s been up for about two years
In ADSB circles, I assumed the term ‘cantenna’ meant "a bunch of crap pulled from a rubbish ‘can’ ".
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