Sean,
Yes, you can replace the RTL-SDR antenna with the NooElec version, but 'our' SDR dongle uses an MCX connector, whereas the NooElecs use SMA (the same as our P3i, so be careful not to mix the antennas up).The NooElec SDR 'pairs' are designed for the US market, where 1090MHz is used for ADSB in the same manner as in the UK and 978MHz is used for a secondary 'rebroadcast and information'' channel. This frequency is NOT available in the UK or Europe, so this dongle is of no use here.
You can of course buy NooElec 1090Mhz antennas and SDR dongles separately. Just be careful what you are buying.
Regards
Peter