60 30 17 12m fan Dipole evaluation

[ai8o]

After doing some major tree trimming in my back yard, I have discovered that I have a 137 foot clear path between two 70 foot trees.

Assume:
1) That I attach the ends of a Fan dipole to each tree at about 40-50 feet.
2) that the fan Dipole sections are cut for the center of the 60m, 30m, 17m, and 12m bands
3) I use an Alpha Delta Delta C center and end insulator set ( I already have this)
4) 100 feet of RG-8X feedline
5) 12 gauge stranded copper wire for the wire elements
6) I will center the antenna in the opening using rope to connect to the trees.
7) the antenna will be oriented North-South (010-190 degrees) the antenna will be parallel to and approximately 40 feet from my already existing 80-40-20-10 fan dipole
8) my location is Grid Square EM95ut.


Questions:
1) what kinds of performance should I expect in each band?
2) what is the optimal attachment height of the antenna ends?
3) any other comments?

Dan
AI8O

 

[prcguy]

If your wanting the best low angle takeoff for DX that would be with the antenna at 1/2 wave or multiples off the ground. The first 1/2 wave for 60m is about 93ft and a half wave for 30m is about 47ft. A full wavelength for 17m is about 52ft and a three 1/2 waves on 12m is about 54ft. I would think an overall height of about 52ft might be a good compromise for low angle takeoff on 30, 17 and 12m with 60m being about 1/4 wave off the ground and great for regional NVIS coverage plus it will do some DX also.