# Parameters needed to calculate inductor value to achieve proper phase delay?

I'm thinking about trying a coil in my collinear 5/8λ antenna, instead of the 3/8λ phasing delay line between the lower and upper elements pictured below.

I figure that a coil with a certain inductance could give me a current delay of nearly 90° and the remaining 45° might be achieved by the overall length of the wire used for the coil turns. (Please correct me if I'm wrong about any aspect of this thought process.)

So if I'm not off base on the previous idea, then my question is, is it crucial to use a specific value of inductance so there is an impedance match between the top of the lower element to the bottom of the upper element, and would the impedances between those two elements be different? Does the coil have to be of a value that helps the impedance mismatch? I'm using MMANA-GAL to model the design, but I can't find any way to see what the impedance values are at any of the given segments.

And since the inductance phase calculator https://www.translatorscafe.com/unit-converter/en-US/calculator/series-rl-impedance/ asks for the series resistance of the circuit, I'm not sure what value to use in this formula? 