RLC receiver - problem dealing with signal
At 500 Hz, a monopole antenna will need to be 150 km long to be able use it effectively as a standard antenna. So your antenna is "short". I don't need to guess because I know you won't have made your antenna 150 km long.

With a "very short" antenna it presents an impedance to the tuned circuit that is capacitive with very high impedance (possibly mega ohms at 500 Hz) therefore the 10k resistor you have used will form a potential divider that virtually kills your signal. However, if you remove the resistor you will have a massively high Q and may not easily tune it plus there will be losses in the inductor that still mean you have massive attenuation.

If you are using a similar antenna to transmit the 500 Hz then trying to drive any signal into it becomes massively problematic because of the high impedance it presents.

Give your self a chance of making this work and adjust your oscillator to produce 1 MHz and forget about trying to make any monopole antenna that will work at 500 Hz. If you need to transmit audio a simple diode and output filter can modulate AM so you can pick it up on an AM receiver.

In the near field you can get capacitive coupling but you'll need a return path for the current and I think this defeats the object of what you are trying to do.