It is equally correct to say that the radiation resistance of a dipole
is 2*73 = 146 ohms, since this is the value when the radiation
resistance is assumed to be uniformly distributed along its length as
is the conductor resistance.

For calculating purposes the radiation and conductor resistances can
simply be added together.

And when referred to the end of a dipole, at HF the radiation
resistance is of the order of Q-squared * 73/2 = 3000 ohms. Although
this is somewhat indeterminate because of the difficulty of feeding an
isolated dipole at one end. The conductor diameter also plays a
significant part.
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Reg.