Which one is the best antenna?

[abcd567]

You can just ignore problem of mixing 50 ohm with 75 ohm

@abcd567

Calculation of signal loss in dB for a 75 ohm equipment connected to a 50 ohm equipment:

The FA antenna has an input impedance of 50 ohms, and RG6 coax has impedance of 75 ohms, a mismatch occurs.

However, the mismatch loss when using 75 Ohm cabling with 50 ohm antenna will be very minimal at around 0.177 dB. So dont worry and mix the 75 ohm with 50 ohm system.

How I arrived at figure of 0.177 dB?
When 50 ohm mixed with 75 ohm,
Reflection Coefficient Γ = (75-50)/(75+50) = 0.2
SWR = (1+Γ)/(1-Γ) = (1+0.2)/(1-0.2) = 1.2 / 0.8 = 1.5

Mismatch Loss in dB = -10 log (1 - Γ²) = -10 log (1 - 0.2²) = -10 log 0.96 = 0.177 dB