Where in your yard do you want to display it? In a bed, in the lawn, etc?

The most common and sturdy way I’ve seen (for lawns and beds) is to have a concrete base poured, then screw the base (using specific hardware that isn’t as noticeable) of the sculpture onto it. I’ve also seen a flat piece of concrete used, such as a very heavy thick stepping stone, again with the sculpture base attached to it. But that option depends on how top heavy the sculpture itself is, wind conditions, ground being level, etc.

Googling brings up other ideas and DIY tutorials.

Thank You for replying; I want to place it in a flower bed in front of the house.

pics? A 5 ft tall straight vertical piece will be mounted differently from one that tapers at the top or from one that widens at the top, for example. Could end up over or underbuilding depending on what you have,