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To get effective power transmission it is best to have at least a 1/4 wave length antenna. It's late and I'm tired or I would look up the calculation for that...
As an alternative you can actually use magnetic induction to transmit data at low frequency. That will work up to a few meters.
Magnetic induction transmitters were once a popular hobby project. I did often run a loop of wire around a room linked to a high power audio amplifier when I was a kid. Strangely enough there is zero information on the internet about them now.
If you really want to transmit EM waves at low frequency (at low power 1 W< and low efficiency 1%<) you can use a ferrite rod antenna.