Step 1 - DIG a hole , a really big hole. Its glacial deposits , about a foot of topsoil and rocks then a sandy gravel , rock dirt and root mix.
Step 2 - Drop tower sections in the hole
Step 3 - Put all the rocks back in the hole.
Step 4 - admire the result
The rocks are as good as setting it in concrete. The tower below was put up 20 years ago. I use it to discharge the hill to cut down on lightening damage ... it works!