Ok, so let's say 456pF. That seems the most likely of the available numbers. (And your meter is lying, it can't be both inductance and capacitance at a given frequency; 2.55mH at 100kHz would be +1600j ohm reactance, while 456pF would be -3490j. If it's inferring from |Z| instead, clearly the two checks were not at the same frequency. It might not even be a single frequency, but harmonics included as well.)
At 800kHz, 456pF is 436 ohms. The antenna is electrically short, so if we resonate this with a series inductance of 69.4uH, we get a remaining ESR of losses plus radiation resistance. Radiation is likely a few ohms worth. This can be matched with a transformer, or a fairly low tap on the coil, to give a more reasonable 50 ohms, or whatever else you might need for the circuit (a BJT CE amplifier for example might have an input impedance of low kohms).
"Radiation resistance" means the Thevenin equivalent (for series, or Norton for parallel) resistance that's coupled to radiating fields, i.e. the source resistance for received signals, and the load resistance for transmitted signals. These are of course perfectly reciprocal so we can use both directions interchangeably for analysis purposes, and make our word choice based on context more or less (which, we're only receiving here, so that's fine).
If the resistance is say 2 ohms, then that can be matched to 50 ohms with a 1:25 impedance ratio, or 1:5 turns ratio. Connect this transformer in series with the ground return of the inductor, and there's your matching. A ferrite toroid >6mm would be a fine choice, and a couple turns primary will do.
For parallel resonance, the same inductance is used, but the parallel equivalent resistance is Q times higher instead of lower; that is, for Zo = sqrt(L/C) = 390 ohms, a 2 ohm ESR gives a Q factor of 195, so the EPR is 195 times higher or 76kohm. This will be as good of a match to the scope probe as you can get, without extending it as a transformer of course (and even then, 100s of kohms are hard to construct in general, with stray capacitance and losses tending to limit things). Or for an amplifier, most op-amps will be fine with that, or a JFET (common source).
Which since this isn't a two-terminal capacitor but one antenna to space, we are limited to one side being common-ground (which, we need an earth return wire somewhere; an earthed scope will do), and then the only meaningful difference between series and parallel is whether we connect the load in parallel or series with the inductor.
Parallel includes a tapped inductor, by the way. Or, mostly does, if the coupling factor between halves is good. A 39:1 tapping would match parallel resonance to 50 ohms, but somewhat higher might be needed for tapping a single-layer solenoid (which will also need to be re-tuned as the 50 ohms shunts out part of the inductance).
Tim