From experience of the H7s and a Octagon 8008 the Octagons tuner was better on weak sats than the Zgemma. Can not give you a side by side on a Gigablue though.Between the gigablue and the zgemma h7s which one has a stronger satellite tuner for weak transponders. Does anyone know of another receiver with better satellite tuner than these two?
Maybe you have not considered the Octagon its worth a look.