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Can You Really Boost your Wifi Router Signal with a Beer Can?

September 15th, 2011 Leave a comment Go to comments

I’ve recently come across an interesting and amusing story entitled “Boost Your WiFi Signal Using Only a Beer Can”  on discovery channel website. I’ve said to myself that I’ve got to try with my WiFi router.

The interesting part is that my WiFi router (TP-LINK TL-WR940N) has 3 antennas, so I had to diligently drink three beer cans (LEO brand,  the best local beer in Thailand). Once this was done, I had all that I needed, besides a pair of scissors, a utility knife and some double faced tape.


The Wifi Router and the Beer Cans

The next step was to clean the beer cans, let them dry and cut the bottom and top of the beer cans as described on discover channel blog post. There is no dotted red line on LEO beer cans, but there are yellow horizontal lines that make this can perfect for the job. After less than 5 minutes of hard work, I had my first “beer can antenna” as shown below (and strongly considered drinking another one as a reward for my work).

LEO Beer cut for Wifi Router

So I could try it on the router and realized it would not be practical to use 3 beer cans on this router, and that only two would do. Sorry, my bad. But I think I’ll get over it.

I then cut my second beer can WiFi antenna and installed then on my router by fixing them with double faced tape.

TPLink TL-WR940N with LEO Beer

Wifi Router with 2 Beer Can Antennas

As you can see, this looks absolutely gorgeous, but the router is wall-mounted in the living room and unfortunately not everybody appreciates arts in the house, so it may not stay that way very long.

So this was done, but my “work” was not complete as I wanted to measure the Wi-Fi signal strength improvement or if there was actually any improvement at all.

I chose 5 strategic locations in and around the house to measure signals:

  • Location 1 aka the “sala”  (Sala (ศาลา) means Pavilion in Thai).
  • Location 2 aka the bedroom.
  • Location 3 aka the wife’s office.
  • Location 4 aka the neighbor’s house.
  • Location 5  aka my “playroom”.

I did some measurement with iwconfig in Ubuntu before adding the beer can to the router with the command:

iwconfig | grep “Signal level”

Here are the initial measurements:

  • Location 1: -50 dBm (Quality: 60/70)
  • Location 2: -41 dBm (Quality: 69/70)
  • Location 3: -58 dBm (Quality: 52/70)
  • Location 4: -83 dBm (Quality: 25/70)
  • Location 5: -32 dBm (Quality: 70/70)

I did some measurements with the beer as shown above, but there was some improvements in some locations but results were not that great, probably because the signal of the middle antenna was blocked by the beer cans, so I adjusted the middle antenna to be horizontal and made the beer cans vertical so that it looks that way:

TL-WR940N Router with Beer Can Antenna

Wifi Router with Beer Can Antennas (Vertical Position).

The beer cans make the signal directional so the signal would be likely to gain strength where the can are pointed to and lose in the other direction. I pointed the left can (on the picture) towards my wife office (location 3) and the right can towards my neighbor’s house (location 4) since I’m such a lovely bloke. Location 5 is between the router and location 3.

Here are the measurements with the beer-can improved-wifi-router:

  • Location 1: -50 dBm (Quality: 60/70) – Difference: 0 dBm.
  • Location 2: -50dBm (Quality: 60/70) – Difference: -9 dBm.
  • Location 3: -53 dBm (Quality: 57/70) – Difference: +5 dBm.
  • Location 4: -77 dBm (Quality: 30/70) – Difference: +6 dBm.
  • Location 5: -30 dBm (Quality: 70/70) – Difference: +2 dBm.

So WiFI signal strenght can be improved with a beer can. But this should only be used, if you have specific areas (or directions) where the signal should be made stronger as other place will lose signal strength.


Categories: Testing Tags: beer, tplink, wifi
  1. December 24th, 2013 at 18:22 | #1

    Nice write up. It was rather informative to read. Thanx for it. I like such themes on wireless network and things connected to this matter.

  2. adem
    April 24th, 2014 at 14:32 | #2

    my router has internal Antenna

  3. adem
    April 24th, 2014 at 14:33 | #3


  4. April 24th, 2014 at 15:07 | #4

    That’s a double blow… Can’t get an excuse to drink beer, can’t improve Wi-Fi signal…

  5. adem
    April 25th, 2014 at 07:26 | #5

    🙁 i know bro no beer

  6. Jon Smirl
    April 25th, 2014 at 08:10 | #6

    Search for ‘cantenna’. With the right set of cans you can get 2km range from a router. Of course that range is extremely directional.

  7. Scott
    July 4th, 2014 at 03:37 | #7

    FYI, internal antenna’s can sometimes be brought outside the case… (YMMV)

  8. Ted
    September 9th, 2014 at 01:20 | #8

    you can use soda can. as long as its an aluminum can

  9. jacob beeta
    October 26th, 2014 at 02:44 | #9

    Wooooow,what is avery special thing in those beer can?or any beer can work or leo cans only

  10. Renee
    April 9th, 2016 at 19:58 | #10

    Thank you for the R & D with the write-up. While the results weren’t great, there was some improvement. Certainly worth me trying.

  1. December 16th, 2013 at 19:10 | #1
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