detector - Measuring relative rf signal strength

I'm trying to measure the relative signal strength received by a dipole antenna for orientation purposes. I'd like to do so using an ordinary multi-meter.

I don't know much about RF circuits, but this is the circuit I came up with.

I was planning on measuring the resistance across the banana connectors to represent the relative inverse of signal strength.

Would this work? If so, which diodes and transistor should I use? If not, which circuit is best?