Yagis I have owned or rebuilt

Frequency     :  145  MHz

Wavelength    :  2069  mm

Rod Diameter  :  10  mm

Boom Diameter :  20  mm

Boom Length   :  2586  mm

d/lambda      :  0.005    ( min.: 0.002 , max.: 0.01 )

D/lambda      :  0.010    ( min.: 0.01 , max.: 0.05 )

Elements      :  7

Gain          :  9.88 dBd (approx.)

-------------------------------------------------------------

Reflector Length   : 1004 mm

Reflector Position :  0 mm

-------------------------------------------------------------

Dipole Position    : 497 mm

-------------------------------------------------------------

Director #1 Position : 652 mm ,  Length : 947 mm

Distance Dipole - Dir. #1 : 155 mm 

-------------------------------------------------------------

Director #2 Position : 1024 mm ,  Length : 938 mm

Distance Dir. #1 - Dir. #2 : 372 mm 

-------------------------------------------------------------

Director #3 Position : 1469 mm ,  Length : 930 mm

Distance Dir. #2 - Dir. #3 : 445 mm 

-------------------------------------------------------------

Director #4 Position : 1986 mm ,  Length : 923 mm

Distance Dir. #3 - Dir. #4 : 517 mm 

-------------------------------------------------------------

Director #5 Position : 2566 mm ,  Length : 916 mm

Distance Dir. #4 - Dir. #5 : 579 mm 

-------------------------------------------------------------

Directors / Parasitics are not isolated.

The length has been increased to compensate for that.

http://pencho.my.contact.bg/start/comp/anteni/Yagi.htm

From the Cushcraft Ad:  A148-20T
2 Meter Hi-Lo Cross Yagi
 

Here’s the antenna that solves multi-mode problems!
 

Ten vertically polarized and ten horizontally polarized elements provide  11.1 dBi gain covering 144-148 MHz. The horizontal elements handle your  CW and SSB needs, while the vertical elements cover FM.
 

Hardware is stainless steel. Separate coax feeds allow polarization changes.  https://ameritron.cushcraftamateur.com/Product.php?productid=A148-20T

https://ameritron.cushcraftamateur.com/support.php?productid=A430-11S

Over the years I have found antennas for 2m, 220Mhz, and 440Mhz. Each have been experimented with various results.