How come radiation resistance of half wave dipole is always ~73ohm, despite if antenna is 2cm or 2km long?

..how does bigger antenna achieve bigger radiating power if they are damned to same radiation resistance IRRELEVANT of their size?
Update: It doesnt? Then why are all high power antennas of huge size? For radio station or TV station..
Update 2: I suppose cause they use huge voltage and current. P=IV
Update 3: qrk That "answer" has ZERO relation to my question, ZERO.
2 answers 2