Here's an interesting source - https://balloonmarket.co.uk/lift-ability.  Looks like one of the last couple in the table should be big enough - say 5 feet in diameter for starters.

73, Pete N4ZR
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On 11/8/2021 4:00 PM, Jim Brown wrote:
On 11/8/2021 12:48 PM, Dick Bingham wrote:
I want to try a balloon supported Vertical for 160.
Any advice on sources for balloons? Mylar material
and diameters up to 2-feet would be my choice.

W6JTI and W4EF are two guys I know who have done it (and JTI still does, although he's been finding helium expensive in the last few years).

73, Jim K9YC
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