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Here’s how I do it. I use two pieces of wire about 3 feet long, one connected to the probe ground and the other to the tip. To eliminate 60 Hz hum I connect a RF choke from tip to ground. Positioning these wires stretched out to make a dipole about 6 feet from the transmit antenna yields about 50 mV RF signal on the scope. Just adjust the transmitter and or antenna for a peak reading.
About any configuration of lead wires will work but keep them away from the transmit antenna so you don’t detune the system. The voltage you get depends on a lot of things and the 50 mV I mentioned is only a typical reading for my setup.
When adjusting an antenna system for resonance you do not want to connect any test equipment to the antenna. I have found the presence of my body within 3 feet of the antenna will measurably detune it.