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I am not familiar with the sensitivity of RTL dongles at any frequency, let alone below 500kHz.
However, i suggest that you look at this old post where I showed an amplifier/antenna for 500kHz (ish)
Below is the schematic for an antenna amplifier circuit for long wave radio signals. Where can I find the tuning transformers?
www.electro-tech-online.com
The amplifier does work quite well.
As built it tunes from just below 500kHz to about 1600kHz, it has a modest gain (I have not measured it), but importantly it has a reasonably narrow bandwidth so that it is not overloading the following receiver.
As others have said, you will not get a significant improvement by dunking the amplifier in a bucket of ice or liquid helium!
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