I have been using a V3 RTL-SDR with a Commet 2meter/440 mhz antenna and works great
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I use a discone (50-1000MHz) and have no problems with the
Orbcomm birds. I am at FM08oo, in central Virginia, USA.
I occasionally use a broadband LNA, but all that really does
is extend the distance out a bit.
The "new" satellites, orbital elements 103-119, I can
usually pick up more than 1500 miles out. The older ones
come in at about 500 miles or so.
My better receiver is an RSP2-Duo, but I do almost as well
with an SDR R820T. MultiPSK does a great job automatically
following the birds when using the "Satellites" function.