5 Jul 2015
It is possible this design has appeared here before.
At the current QTH I have no antennas (even dipoles) for 4m, but I worked some decent distances on an fixed indoor dipole at the old QTH. It should certainly be possible to work Es DX with this transverter although I have not tried. I need to erect a 4m antenna!
See https://sites.google.com/site/g3xbmqrp3/vuhf/4m_tvtr .