There is fundamental limit (Shannon limit) on decoding a signal Eb/No = -1.6dB [0] where Eb is energy received per bit of information and No is noise spectral

There is fundamental limit (Shannon limit) on decoding a signal Eb/No = -1.6dB [0] where Eb is energy received per bit of information and No is noise spectral density. This makes it paramount to collect as much energy per bit (Eb) as possible which in turn requires large antennas for far away objects such as Voyager probe. [0] https://en.wikipedia.org/wiki/Eb/N0#Shannon_limit https://en.wikipedia.org/wiki/Eb/N0#Shannon_limit