Greg,
A hole 4X4X8 equals 4.74 yards of concrete while a hole 6.5X6.5X7 equals 10.95
yards. do not forget to add in the 6" lip. I have the HG-54-HD and I poured 9
yards including the lip.
You should be fine and will be able to sleep at night when the wind blows.
Either get a vibrator or have it pumped to settle and wait 28 days for full
cure. I put a burlap bag over the base and wet it daily.
Semper Fi,
Tommy - K6YE
DX IS
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