Sensitivity in microvolts...

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Commercial and amateur receivers work well with an input signal level of ~1 µV. Some are a bit better, some not. Broadcast receivers are mostly happy with a level > 1µV.
What sensitivity level is typical for a 10GHz LNB satellite receiver ?
 

If we consider amplifier noise as sensitivity limit, video signals need at least factor 20 - 50 higher input level for same SNR due to the larger bandwidth.
 

The problem is one of bandwidth as well as ultimate sensitivity.

As bandwidth increases, the noise voltage also increases in proportion.
There is a very big difference between a 3Khz SSB speech channel used for amateur radio communications, and wideband fast data or video which may require several tens of Mhz of bandwidth.

For a very narrow band speech channel, a simple dipole is often more than adequate.
Wide band receivers need much stronger signals at the input, and as mentioned above, a parabolic dish, sometimes a very large dish is the only practical solution.
 

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