Due to the limited space for all the radials of a 160m vertical antenna I decided to put up one of the shortest available 160m dipoles on the market: Kelemen DP-1608040-H. This dipole has a lenght of 54 m which is twice the length of my old 40/80m dipole. One dipole leg fits straight between my two masts about 12 m above the ground, the other leg goes down from 12 to 9 m to a power pole. After some tuning the final SWR for the SSB segments looks like this (likewise on CW with additional wire):

DP-1608040 SWR curves