Andy,
This is incorrect, ADS-B in is made up of several services and you
are confusing the TIS-B requirements for FIS-B.
TIS-B (Traffic Information Service - Broadcast) which is traffic
information for non ads-b equipped aircraft - for this you MUST be
ADS-B out equipped to receive your "hockey puck" of traffic.
Without being ADS-B out equipped you will only see other ADS-B out
equipped traffic and traffic from somebody else's "hockey puck" (
the hockey puck is traffic that is +/- 3500 ft and 15mile radius
from your position)
ADS-R - ( R for rebroadcast and is part of TIS-B) this is simply a
rebroadcast of 1090 to 978 and vice versa in the event you can only
accept one frequency (you must be ADS-B out equipped and your
transponder must request the ADS-R rebroadcast).
FIS-B - (Flight Information Services - Broadcast) this is all the
other data that the FAA sends, such as weather, notams, pireps, SUA
status etc etc etc, this is continuously broadcast and does not
require ADS-B OUT to receive but does require ADS-B in on 978mhz
(UAT).
Unless you are physically very close to an ADS-B ground station, you
will probably not receive FIS-B services on the ground. The FAA
claims that FIS-B data should be receivable almost everywhere in the
US once you are 2000 or 3000 agl (I don't remember the exact value)
as the signal is only receivable as "line of site".
Jeff