rtl-sdr.com

That sounds like the most likely scenario. As admin says, the yagi is unidirectional, but it is also tuned to the TV frequencies and may not perform well outside this band. Additionally the amplifier may also contain a filter to reject out of band signals. Some amplifiers have a second input for an ...

I use that: https://www.tindie.com/products/hagster/ultra-wideband-vivaldi-antenna-800mhz-to-6ghz/ The problem is the are a little bit brittle. The actual antenna is fairly strong and I have yet to break one, but it is possible to damage the connector, especially if attaching heavy coax. If you hav...

I can recomend my spiral antennas for covering 300MHz upward. They also seem to work fairly well from 90 to 200Mhz, but no use at all at HF.

https://www.tindie.com/products/15447/

I have never heard of anyone getting arrested in Europe for scanning. Rules are probably different for different countries in the EU, but so long as you are not demodulating and intercepting comms where people would have an expectation of privacy, you are probably ok. The old classic was listening t...

The impedance should be approximately real as the length has been tuned to make it resonant(XC = XL). If possible it is always better to tune an antenna this way rather than rely on a matching network of L's and C's to shit it round the smith chart. Sometimes (particularly with small antenna) this i...

Its rare for a satellite to actually be directly overhead. Most commonly they will acutally be at a lower elevation. The Lindenblad (double cross) is designed to give circular polarisation as a replacement for a linear dipole. For coverage at 90degree elevation you can use a turnstyle(crossed dipole...

I would expect this antenna to have a null directly above and below.

https://www.amsat.org/articles/w6shp/lindy.html

We can't see the actual antenna, but it's probably an L-Band circular patch antenna. The 'directional coupler on the back is actually a 90 degree hybrid used to feed the antenna and provide the circular polarisation.

Thanks for the info on that. I will definately look into openHPSDR and its derivatives.

It was an experimentation radio I was looking for. Something that works with GNU radio and has a bit more dynamic range than the HackRF for instance.