If you want to casually listen to one signal at a time then the
receivers mentioned are OK but you can pay a lot and get very
little extra. But if you are into digital modes or want to monitor
different bands with one receiver then KiwiSDR's, Red Pitaya or
Hermes Lite 2 offer 4-16 separate receivers per device. It is not
uncommon for the people spotting on PSKspotter or WSPR.live to run
24- 48 virtual receivers 24 hours per day. A great deal more
interesting than listening to a single receiver.
Cost wise you can buy 24 virtual receivers for the cost of one
old fashioned expensive single channel receiver. The KiwiSDR is
also a great deal more advanced? than any of the others for
general listening with a longer list of decode modes than any
other SDR. You can also try before you buy via kiwisdr.com
73, Alan G8LCO
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