[CQ-Contest] 80 mtr antenna

[Glenn VA3DX]

I need a bit of advise.

I currently use a standard Inv V on 80 meters.
I would like to change this to a Delta Loop.

I have been told the total length should be around
265 feet., and for vertical polarization it should be fed
at the bottom corner. I have the 100 Ohm matching stub
already to go etc etc..

My question is this. Since the two sides of the antenna both
reach into my neighbours yards on either side, (with their
permission )  I hesitate  somewhat on running the feedline
 to those points.

Currently the Inv V is fed at the top of the tower, at 70'.
If I lengthen the Inv V across the bottom to the required
length and thus make a Delta Loop., what sort of 
polarization would I expect to see if it is fed at the top
of the tower ?????

The hardline and antenna switch unit is already up there,
so this would simplify things somewhat.

My interest is in DX , contesting, and a low takeoff angle.
Local ragchewing is not a priority.

Thanks for any thoughts... Glenn VA3DX