Cloverleaf Antenna - Flite Tip

Linear Polarized Antenna's send out a straight signal which can reflect off of objects in the signal path. The reflected signal can cause interference with the transmitted signal cause static, wavy images, or even signal lose. The Circular Polarized Antenna sends out a circular pattern that rotates in one direction.  

When this signal hits an object the signal is reflected in the opposite direction of the sending signal canceling itself out and thus maintaining a strong signal.

With all that to say, it's basically a great option for flying FPV! An important thing to remember when purchasing or making your circular polarized antenna is that the transmitter and receiver antenna need to be the same direction.

To see which direction your Cloverleaf antenna is going, imagine it as a 'drill bit' and the direction that the cutting edge of the antenna needs to rotate is how you can determine which direction your signal is sending.

This diagram shows you how you can tell which direction your antenna is setup.  

Below is a sample of what happens when your transmitter and receiver have a matched antenna setup and what happens when you have a mismatched setup.

Though the winds were pushing the Bixler around in our tests, you can see that the signal is much better with matched antenna's.  

For more information about Circular Polarized Antenna's check out the links below!

David Windestål - Cloverleaf Antenna Tutorial

Chad's Cloverleaf Antenna DIY Jig

IBCrazy's Circular Polarized Omni Antenna