True it doesn't contribute to the signal reflected onto the focal point. But it does block thermal noise coming from beyond the rim of the dish. The lnb's response tapers from a maximum in the middle to about 3db down at the edge of the dish. So thermal noise from beyond still degrades SNR...
Actually i would prefer them on satellite to reduce clatter. I mean, you don't want to clatter your living space with a pile of receiver boxes. The ideal solution would be to buy a DVB T2 capable TV if you can afford. Besides most terrestrial boxes around currently are clap. I haven't tried the...
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