If the signal is relatively constant, triangulation is fairly straightforward. Hold the receiver against your chest and slowly turn in a circle. When you find the minimum, the source is behind you and your body is blocking the signal. Draw a line on a map, move to another location, and repeat.
You can do this with a $26 antenna on a $25 RTLSDR on a $5 OTG cable plugged into any random Android phone. It takes a minute to install the spectrum analyzer app, probably two minutes to plug everything together, and about a minute per "reading". The rest of your time is spent driving.
This is a massively fun hobby I would encourage anyone reading this to consider. Start at the rtl-sdr.com blog and read some archives, there's a ludicrous amount of stuff within the reach of this incredibly cheap receiver.
You can do this with a $26 antenna on a $25 RTLSDR on a $5 OTG cable plugged into any random Android phone. It takes a minute to install the spectrum analyzer app, probably two minutes to plug everything together, and about a minute per "reading". The rest of your time is spent driving.
This is a massively fun hobby I would encourage anyone reading this to consider. Start at the rtl-sdr.com blog and read some archives, there's a ludicrous amount of stuff within the reach of this incredibly cheap receiver.