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A simulation using a short 1m RG58 coax cable, shows that S21=-0.25dB and S11=-25dB.

50 ohms resistors placed either at the input or at the output, degrades S21=-3.8dB and S11=-10dB.

Using a long 20m RG58 without 50 ohms resistors, S21=-4.9dB and S11=-30dB.

The same 20m RG58 coax cable, with 50 ohms resistors placed at its ends, shows that the resistors (wherever they are placed) degrades the transmission line insertion loss S21=-8.2dB. Return loss S11 is better with 50 ohms resistor placed at the output compared to the input (-22dB vs -10dB).

In all cases a 50 ohms antenna was assumed at the output, and frequency of 50MHz.