Topband: Help with inverted L

[kp2bh james soto]

Hello to all
Iam in the proccess to install an inverted L for 160.the vertical portion will be about 50 feet hight
and the horizontal portion about 85 feet. i have a remote coaxial box install at the tower that the installation of
the inverted L will be.my question is  how much coax to use to feed the antenna do that the coax box is just where the antenna will be install. 
thanks de kp2bh  jimmy