But that real impedance which it's in series whit the antenna impedance (the antenna's real part is the loss and the energy radiated), it's hoe? there is not another resistance. The reactance make of capacitors and inductors are filters and make the correction antenna reactance. Because the tank circuits, which resonate is in other step (in the first step).
The resonance circuit it's the BB115 and L1 whit the trimmer. It's in the first step. So it's not the transmition's output impedance. The elements in the output are L5 L5 and the 15p , 1n, 56p and 47p capacitors. It's all reactance, there is not 50 Ohms (real impedance) likes antenna which has 50 Ohms, there is j Xc.