The Receiver here is a RTL-SDR.COM V.3, further information about this Receivermodel is on the RTL-SDR Homepage as linked & shown below.
The active Antenna for VHF & UHF does not work below about 50MHz, so the Reception below about 50MHz is weak, although technically the Reception starts at 500KHz, sometimes stronger Transmitters come in on Shortwave. Sometimes I use a 3m long wire instead that Active Antenna. I think of improving the Antenna for Shortwave in Future.
A Hint for tuning this SDR :
On WFM increasing the RF Gain increases the Receptionquality but on NFM increasing the RF Gain deafens the Receiver and in WFM alone the RF Gain needs Adjustment too for better Reception.
I usualy like the Music from the WDR4 Broadcast on 100.5MHz and to listen to talkradio on 90.6 or 106.2 etc. but of course the Radio is not limited to receiving Music or talkradio or to certain Frequencies, it's interesting to hear other Frequencies other Globaltuners globaltune to, enjoy listening and please keep the Language clean.