[Antennas] 10 metre yagi

[Alan]

I am looking to rebuild my 10 metre antenna while the band is quiet, and 
I am interested in any good ideas on design.
I have a maximum of  5 metre length boom.
The elements would be 1 inch  except for small lengths
(some could be up to 18 inches long) at the end for adjusting element 
lengths and they would be 7/8 inch tubing.
I am assuming it would have to be a 4 element beam although if there is 
something better  then I am interested... currently using a Gamma match 
but would maybe interested in a design using a Beta match.
Any suggestions and ideas  would be most welcome.
Alan ZL3KR