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From: rbowman <bowman@montana.com>
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Subject: Re: More on wifi range - Pi PICO W Oil level sensor
Date: 25 Dec 2025 02:29:33 GMT
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On Wed, 24 Dec 2025 12:16:27 +0000, The Natural Philosopher wrote:

> On 24/12/2025 07:58, mm0fmf wrote:
>> On 11/12/2025 21:18, Carlos E.R. wrote:
>>> Home made with a box of Pringles. just google for "pringles wifi
>>> antenna".
>> 
>> Also Google cutoff frequency and see that the Pringle tube is too small
>> in diameter to be effective at 2.4GHz.
>> 
> Assuming that is a relevant issue.
> 
> Shouting down a pipe whose diameter is way less than the wavlength of
> voice frequencies, still works....

True, but the benefits of impedance matching with a megaphone were 
discovered long ago.