With everything disconnected but the power, ground, and network cable I am getting substantial spurs on 80 meters - 4 of them just above the bottom of the band in a sawtooth pattern that are 8Khz apart... the outside 2 are a little weaker than the other 2 but all 4 rise above the noise floor when I do have the RXA antenna connected (HiZ 8 element RX array). Likewise up the band I get another single spur every 63Khz for a large portion of the band. Again not anemic and there when the actual RX antenna is connected. [in both cases the absolute level remains about the same with and without the RX antenna connected so with the RX antenna you can see their 'peaks' coming out of the noise floor]. To state once again this is with NOTHING connected but the ground, power and network. The latter 2 are wound around a decent size core multiple times (and it made no difference in the level before and after). Further this is there whether I'm using the Maestro or SSDR. I'm using 1.10.9.