A pretty realistic, wide-band scan covering the entire bandwidth of RTL based dongles.
Spektrum - How-to Speedily Scan RF Noise in band 24MHz ~ 1800MHz
The results of scans are below:
The scan 1 shows RF noise picked by antenna and processed without any filter , The scans 2 & 3 were done with filters, and show how filters remove this noise.
Scan 1 of 3 - FA Antenna + Generic DVB-T (no internal or external filter)
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Scan 2 of 3 - FA Antenna + ProStick Plus (Only Internal filter of ProStick Plus. No External filter)
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Scan 3 of 3 - FA Antenna + ProStick Plus (with internal filter) + External Filter (FA Light Blue)
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