The tower of your homemade windmill is very important because it determines how efficient your wind turbine will be. The main reason is that you do not want obstruction from the wind by other factors so it is wise to have your tower up to 30 feet above ground but remember I am saying "up to 30 feet", it is dependant on your location.
Other factors to consider
Does your location have flat land, is it uneven and are there many trees in the immediate area. It is fine if you need to place your windmill away from your home but I would not recommend any further than a 300 foot radius.
Tower base
Make sure that the base is very solid and grounded, generally it is wise to dig into the ground a few feet and have a concrete base. If you do not want to use concrete I recommend stainless steel or very hard wood. In terms of your hole cover the base of the hole with sand, pebbles, sand again and then place the tower base on top of this.
Tower materials
The best thing to make your tower out of is steel piping so that you can run your wiring down through the middle of it, this prevents wear and tear on your wires. Have 3-4 straps or metal cables attached to the top of your tower and secure them into the ground with pegs or sand/water/concrete weights.
Final tips
Remember your tower is facing the elements so paint it for rust prevention if need be, make sure the straps (metal cables) are a few feet below the complete top of the tower and all your wiring is securely strapped or screwed down.
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