Quote:
7 inch whiskers on 5.25 inch centers
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That's actually a very poor design. Locate the plans for the 4-bay by MClapp instead if you want to "roll your own".
Ultimately, you will have to experiment with the mounting location. Getting the antenna to a spot where the signals can best get to it is the key. There is no specific height that we can say is best - you'll have to discover that with the antenna in hand. Generally, look for a mounting location that offers the best combination of a clear line of sight with height. Sometimes it's simply impossible due to conditions beyond your control.
Good luck with your project!