Many years ago, Ted, W6HX used to do that on many of his tower installations
along with 20 and 40 meter monobanders.
Remove the 15 meter traps from the driven, 15-20 reflectoe, and 10-20
director.
On te reflector add a 7/8" x 12" tube and set 8 11/16" out of the existing
element.
On the driven add 14 7/8" x 1".
On the director add 21 1/4" x 7/8" and set 18 1/4" out of the existing
element.
Makes a real nice inexspensive 4 el 10-3 el 15 dual band antenna.
I have several old TH6 antennas for sale if anyone is interested in this
project.
Skip, KJ6Y
http://members.aol.com/kj6y/skip.html
818-887-3569
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