I am trying to build an antenna to connect to the GOES-16 satellite (downlink at 1690,1MHz, linear polarization) with my SDR. My plans are using a 1m offset parabolic dish with a BiQuad feed, connected to a RG-58 coax line (50 Ohms) and followed by a filter (I have not decided yet wether to use a SAW filter or a end-coupled microstrip one)and a 20dB LNA. I live in a place where it will be difficult to get the signal from the satellite due to its low elevation and interfereces, so it is crucial for me to optimise the most the design.
Since the BiQuad is a type of dipole, I imagined that I would need a balun to improve the overall performance of the antenna. Assuming that the antenna is sufficiently well matched to the 50Ohm coaxline, only a 1:1 balun would be needed. However, most of the SMD baluns I find that handle this frequency carry an insertion loss of around 1-3dB with them. Hence, my questions:
Is it still worth adding the balun in spite of the big insertion loss? Would the losses/noise of the receptor without the balun be more inportant that those 1-2dB? Do homemade baluns (5-6 turns of coax cable) also have this insertion loss?
Thank you in advantage.
Edit: changed values of insertion loss to more common ones