This is Markus in his shack.

The 136kHz power amp

This is Markus' PA stage. I assume the devices are mosfets. The LPF uses air cored coils and maybe the output transformer does too....?

The antenna

The wire antenna is supported by this fibreglass mast on the chimney. The plan below shows the arrangement. I bet it's difficult to keep in tune when the weather is windy!

The plan