What can be done to reduce RF in the shack (riding back along the coax) when using a vertical 10M antenna (without radials due to space constraints)? The antenna is an IMax-2000 at 32' elevation (20' over roof) with a 125' coax LMR-400, SWR is under 1.5 across 10M band. No balun, no tuner. Cable length is required to reach the shack room (basement). Max power 100 W with interference level increasing with greater power output.
This is causing interference with capacitive touch lamps (on, off on transmit); as well as causing speakers around the house (even when turned off) to broadcast the operator's voice (a ghoulish combination with the flickering lights).
The height of the mast was adjusted from 1' to its present 32' over ground level, with no change to SWR or interference as described above. The mast was tried with and without grounding (to an 8' ground rod at its base), no effect to SWR or interference level.