Amateur VLF is different. As antennas for TX are usually large and powers high to get a signal radiated, very stable and long signals are needed that are often integrated over hours or days in very narrow bandwidths. For RX only tiny E-field probe antennas can be very effective.
On my website www.g3xbm.co.uk you will find links to my earth-mode blog which gives details of my experiments below 10kHz with 5W and simple gear up to 6km. Big antennas are NOT needed for this. Signals are visible on a PC screen in seconds. This is a very accessible way of getting on amateur VLF.
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