In particular, the lead lengths can be a problem. The input is on the left and the 270 pF capacitor and ground are the input points. The 10K resistor cuts the sensitivity of the probe a bit, but it helps to make the Voltage independent of the particular DC Voltmeter being used on the output. The 270pF capacitor is what I grabbed out of the drawer. It is fine for frequencies down to about 10 MHz.
Larger values are OK as well.
Note that with a capacitor on the input, one can use this probe on spots with DC as well as the RF Voltage. It is built on a scrap of PC board. They can be bent to fit the spot being probed, as it is important to get a good short ground connection. I used small coax to run to the DVM, as can be seen on the right. The diode is at the left edge and hard to see.