The Horn Antenna seems to be a favorite goto and for good reason.
All you need is Aluminum flashing 20″x10, a empty paint thinner can, aluminized HVAC tape, N-to-SMA adapter, N Connector, Nooelec SDR and LNA. The cost would be roughly around $100.
The software can be either HDSDR or SDR#.
Will update after making this myself and testing it. More to come…