You certainly can't get much more LF than that:-)
Joking apart, I've never even considered making one.
You can buy them new online for around £15, standard 5 volt supply via
the coax, and I would have thought it could end up costing more than that to
make your own in small quantities.
New to LF I presume because there is a big connection between LF and GPS
concerning timing procedures and sync for some experimental data modes on
Lacking a sense of humour I presume because yes I am aware and thought
perhaps the :-) and "joking apart" might just have give a slight clue and
perhaps even lifted a smile in return:-)
It was a joke...............J O
Joking apart, yet again again, amongst my quite extensive collection of
frequency standards and precision oscillators I do have more than one
Although some do come with a supposedly "matched" antenna, badged by
the manufacturer, most, if not all, adhere to the common standard.
I've bought antennas from the US for $15 and smilar ones can be bought in
the UK for around £15 as I said before so it really isn't worth thinking about
building one these days.