Arduino-based DIY antenna analyzer
Antenna analyzers are a common tool used for troubleshooting antennas and fine tuning them for optimal performance. They might cost anywhere from a couple hundreds dollars to thousands based on quality, features, and frequency range of operation. For a low frequency application (< 30MHz), this Arduino-based DIY Antenna Analyzer can be build under $40. The key component of this design is the AD9850 DDS module that can be bought on eBay for less than $5.
DIY antenna analyzer
The following video shows the demo of this project.
via [Hackaday]