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It is to be used in HF as said, so 2-30MHz.1) Impedance is a function of frequency; your post is NOT a function of frequency
2) Impedance is also a function of the setting of your pot.
Brian, To present a constant input impedance and at the same time allow the pot to adjust the input signal, I was thinking of a stereo pot, say 2x 500 ohms. One gang will be connected as a usual potential divider. Its wiper, will be connected through a 500R resistor to the wiper of the second gand. i.e. the second gang will be connected in reverse.Rough estimation is it will be like most common emitter configurations, middle impedance, probably several hundred Ohms to a few K. That is assuming the pot is omitted or set to maximum. Note that most potentiometers will work badly at 30MHz too.