some great links on reducing the RFI in Radio Astronomy
Look at this Ham Radio: receiver.
Consider a SDR (software designed radio) on this site, let your PC control the Radio parameters.
Consider GNU Radio as a great software option for Ham Radio.
Here is another great article on Very Weak Signal Reception with Small Magnetic Loop Antenna.
Inductive Coil Magnetometers vs SQUID
Here is a great article on
Just got my Amateur “Ham” License from the FCC, call letters: KG7WLW (General Class)