i would like to ask you 2 questions:
1) the radials increase or decrease the inverted L efficiency when i don't use 50ohm antenna (coaxial cable 50ohm and 50ohm coupler). i know that when we use an 50ohm inverted L the radials increase the antenna's efficiency.

2) i would like to ask which antenna is better for 160m? 1/4 wavelenght inverted L , 3/8 wavelenght inverted L or 1/2 wavelenght inverted L ?? thanks