In message , Harry Brown
writes
I'd like to try building a loaded Yagi. I came across plans for a 20
meter mini Yagi while Googling, but I want something for 15 meters.
Are there any simple, free calculators available? Also, can anyone
tell me a ballpark figure how a 15 meter shortened (by 40%) 3 element
Yagi would compare to a full sized one? How about if I added an
additional element for 4 loaded elements instead of 3?

Thanks,
harry

MMANA has a 3 element loaded yagi as an example.

Http://hamsoft.ca/pages/mmana-gal.php and it's free

Short Yagi W1FBY & WA1LNQ

It's got a gain of about 4.7dB

I dare say 4NEC2 will model it as well.

Brian GM4DIJ
--
Brian Howie