This area includes the area of the fuselage and any fin area below the fuselage. You do not want to loose your tail in a tight turn at low speeds. This is one good reason to use a V tail. TOP Vertical Tail Taper Ratio Taper looks nice and is almost mandatory in the tradition of aircraft design. Again Watch out for small cords that can cause trouble with reynolds numbers .
Some sweep looks nice and it does lengthen the moment arm for yaw.
Watch out for small cords that can cause trouble with reynolds numbers . It should be located ahead of the neutral point . It improves maneuverability and reduces stability. The reynolds number is the ratio of inertial forces to the viscous forces. It is the most important parameter to compare flow characteristics surrounding an airfoil.