as far as the generator is concerned, in a series-resonant LC circuit(with no resistor), L and C can be replaced by a resistor with the same value of L x C?

 

or can you just replace it with a peice of wire?

 

You need L and C for the circuit to be resonant.

 

as far as the generator is concerned, in a series-resonant LC circuit(with no resistor), L and C can be replaced by a resistor with the same value of L x C?

In part this is correct - at least at resonance in a series LC circuit the effective impedance becomes equivalent to a resistance. If L & C are ideal then the effective resistance would be zero at resonance. But just replacing L & C with a resistance does not give an equivalent circuit at all other frequencies. For instance, a series LC circuit will not pass continuous DC current, whereas a resistor will. At all other frequencies the impedance is reactive - increasingly inductive above resonance and increasingly capacitive below resonance.

 

the only time I've seen replacing a series resonant circuit (antenna) with a resistor is when you connect the transceiver up to a dummy load.