Yagi for the VHF 146 mHz
 

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

This UDA-YAGI antenna 5 elements very easy to build
 

The boom is made of ¾ PVC plactic pipe, all 5 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
 

Use a WiseGrip to align all the holes

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

I applied two 4-40 screws to connect the coax
 

The SWR is less than 1.5

The SWR is good and the impedance is almost resistive "J" is only 4 ohms
The gain is very good and with a 10 degrees, this antenna will
perfect when working in your hand while walking 

The 3D diagram at 10 degrees

Top view

Electrical schematic of the 5 elements antenna

Both UHF and VHF versions

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