There are formulas that will tell you the required loop inductance needed for a specific frequency range but how are you going to measure your loop inductance while building it? There are so many variables it’s hard to duplicate with enough precision from just plans. 10 people making the same loop from calculations or plans will end up with 10 slightly different antennas. You usually need an inductance meter to build the loop to a specific inductance needed to cover the tuning range you desire. Otherwise you build it then you find it’s off some then you change it then it’s off in another direction and so on.
