Modifications

     4 x f </nowiki>

     4 x f </nowiki>

Where:

Where:

* '''c''' : is the light speed

* '''c''' : is the light speed (in m/s)

* '''f''' : the frequency for the antenna

* '''f''' : the frequency (in hertz) for the antenna

* 4 : because it's a quarter length antenna.

* 4 : because it's a quarter length antenna.

So

So for a 433 Mhz, this will gives:

When using such antenna, you have to think about the polarisation of your signal.

 

<div style="margin: 15px 0; background: rgba(204,14,14,.3); display: block; padding: 15px 15px 15px 15px; -webkit-border-radius: 2px; -moz-border-radius: 2px; border-radius: 2px; border: 1px solid #CCC;" >When using such antenna, you have to think about the polarisation of your signal, Andeas Spiess shows it into its YouTube video '[https://youtu.be/J3PBL9oLPX8 A closer look at the “black magic” of antennas, how they work, what is essential, and how to test them]'. If you miss this very simple point, you will lost lot of gain and loose data.</div>

=== Other Antenna ===

=== Other Antenna ===