How is it possible to still be able to get a signal from a spacecraft that's so far away? How can the antenna be directional enough while still being pointed right at the Earth? How do we remove the noise?
And on the receiving end, we have decent arrays of antennas to pick up the signals.
Here's a nifty document detailing the coms of Voyager: https://voyager.gsfc.nasa.gov/Library/DeepCommo_Chapter3--14...
Fig 3-4 on page 46 (page 10 in the document) shows the signal flow.
There are radio antennas across the Earth listening to its very weak signal.
More details: https://space.stackexchange.com/questions/24338/how-to-calcu...
The tech used to receive Voyager signals is not really different, just more sensitive and sophisticated (and expensive).
NASA has a dashboard online for the Deep Space Network and you can see live which spacecraft we're communicating with. The Voyagers are usually active any time I look.
[0] https://blogs.nasa.gov/sunspot/2023/12/12/engineers-working-...
https://www.space.com/22787-voyager-1-signal-interstellar-sp...