From: tauno.voipio@notused.fi.invalid   
      
   On 25.12.2025 0.53, Lars Poulsen wrote:   
   > [Folloup-to alt.unix.geeks]   
   >   
   >> On 11/12/2025 21:18, Carlos E.R. wrote:   
   >>> Home made with a box of Pringles. just google for "pringles wifi antenna".   
   >   
   > On 2025-12-24, mm0fmf  wrote:   
   >> Also Google cutoff frequency and see that the Pringle tube is too small   
   >> in diameter to be effective at 2.4GHz.   
   >>   
   >> Of course, designs on the internet do not have to follow the laws of   
   >> physics! :-)   
   >   
   > As a wireless applications engineer, I have always shaken my head   
   > at the pringles can antenna, which if well made can have a gain up   
   > to at most 8 dBi or so. For less than $50, you can buy a professinally   
   > made flat patch antenna with 8 dBi gain at L-com.com. Apparently, you   
   > can find used ones on eBay for under $30, but why take the risk?   
   > If you need circular polarization, it will be closer to $75.   
      
   The range of license-free WiFi is intentionally limited by limiting   
   the transmit radiation power to any direction to 100 mW EIRP, effective   
   isotropic radiative power.   
      
   Luckily, in practice, the feedline and active radiator matching losses   
   take care of EIRP limiting, so the Pringles can stays out of radio   
   regulation violations.   
      
   --   
      
   -Tauno Voipio   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)