Two ways of doing this.  I use a side arm from W9IIX with a pulley at the 
end making sure that I am 5 or 6 feet below that top of the tower (either 
crank up or fixed).
 If the tower is not over loaded there was a great way of getting the 
inverted V above the tower in a mid 1970's 73 Magazine by Ed Sleight K4SB. 
Ed used a fiberglass mast with a universal joint at the top so as the 
antennas were rotated the inverted V stayed in place.  The main point is 
that the ends were well away from the tips of the biggest yagi.  You could 
use a aluminum mast but that added to any interaction.
 73 Dave K4JRB 
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