antennacurrentindicators
Antenna Current Indicators
Feedline Current Monitors Do Not Show SWR, But Are Handy, Especially For Portable QRP Applications
The original thermocouple RF ammeters are becoming almost impossible to find. However, you can build your own for relatively little cost.
This simple circuit could be tucked away in a corner of your QRP antenna tuner, or inside that QRP transmitter or transceiver.