The first attempt had too few balloons and too much wind. He eventually switched to a non-dollar store helium tank. That balloon inflates to about 36 inches and appears to have plenty of lift. It looks like by the end he was using two of them.
One of the difficulties with the wind was that the line kept tangling on other antennas. But if you really wanted to use a balloon antenna, we’d guess you don’t already have some large antennas in the way. We do hope, though, that the utility lines you can see behind the yard are further away then they look. Tangling in those would be detrimental to your health and your radio.