DX Big Bertha: 80 to 109ft
We are always glad to custom design a Big Bertha that fits your exact needs.
That said, here is a popular Big Bertha Ultimate pre-configured for DXing

DX Big Bertha
99ft BigBertha
Blast through pileups with ease. Enjoy the family-friendly 10 x 10ft lawn footprint with no guy wires. Vandal resistant and virtually maintenance free. Additional antenna configurations and customizations are available.
6M Yagis @20/60ft 2-high stack
Triband 12/17/30 @70ft
Triband 10/15/20 @80ft
40M Yagi @99ft
80M Vertical @ side-mounted to Big Bertha
Typical design is for TIA-G and IBC-2009 for 90mph basic wind speed no ice, 60mph service wind with no ice, and 40mph wind with 0.50 inches of ice), Structure Class II, Exposure category B or C, Topographic category 1, Earthquake category not considered (site location Ss < 0.33)