Yagi for the UHF 430 to 450 Mhz
 

Thank's to Pierre VE2PID who made all the simulation with EZNec
 

Here is an Yagi 8 elements wery easy to build
 

The boom is made of ¾ PVC plactic pipe, all 8 elements are made of 3/16" aluminium rods.
A RF Choke was made with a couple of turns of RG-58U coax

All measurements are in inches

The elements material came from an old antenna
 
 

The Driven element look's like a J-Pole type
 

I applied two 4-40 screws to connect the coax

The driven element is made all in one peace and need to be 9/16" center to center

of the two rods.  Make the element a bit longer and file to get the best SWR

Adding two terminals logs make it easier to connect

The driven and the coax RG-58U are completed

Use a WiseGrip to align all the holes

After appling the driven the Yagi will be completed

Make the holes a little bit smaller than the aluminum rod than apply some CrazyGlue

The SWR is less than 1.5

The SWR is good and the impedance is only resistive
The gain is very good and with an 10 degrees, this antenna will
perfect when working in your hand while walking 

The 3D diagram at 10 degrees

Electrical schematic of the antenna

Both UHF and VHF versions

Here is an easy solution to communicate with both AO-27 and AO-51 satellites