Power loss due to mismatch impedance connector in coaxial line
The mismatch loss is almost certainly half of nothing, the connectors length being negligible compared to the ~2M electrical wavelength.
However, if that is an N type, be careful, 50R and 75R N types are NOT compatible and trying will either damage the female or make unreliable contact (depending on which way you try it), the centre pin geometry is different.