I might be wrong but didn't WRMI use 6915khz 15 years ago or so? Anyway I don't understand why they would even consider operations down in the part of the band... It's almost like a 'graveyard' assignment in the broadcast band.
With the conditions of late I haven't heard WRMI above the noise level (vertical or horizontal) here and I wonder where they are broadcasting to... perhaps the western areas? Even then its a waste of kilowatts in my opinion. But Bro. Stair(knutcase) has plenty of money from all the 'lost' folks of his 'flock'.
As for MARS... I suspect they have more power to get things done these days because of the changes after 911. I may be wrong but it seems to me it goes like this; MARS <> FEMA <> HLS. MARS does NOT deal with the FCC, they have to go with the 'chain of command'. I had to leave the program for personal reasons awhile after the changes were made solid so I could be wrong.
If I am on chat and I hear MARS operations I generally make their active frequency known but I only seem to hear stations in the 3rd and 4th zones. As most of you know they generally operate on frequencies such as; 6905.5khz, 6910.5khz, 6915.5khz, 6925.5khz... all the way up to 6995.5khz USB, but this is not absolute. Lately I have heard a very strong data signal around 6950.5 +/- but I don't think that is a MARS station perhaps a FEMA station or something of that nature. FEMA has HF nets also and there are some cross operations such as MARS on FEMA nets etc. 'Command' stations may show up on any net at anytime.
Every net has a secondary net frequency which can also be used depending on the real time situation.
One important point I would like to make is this, do not assume that any SSB signal you might hear is a 'peskie'... listen to make sure what is where, I am sure everyone knows this but I feel it is worth repeating here. I seldom 'log' MARS or FEMA nets in my paper or electronic log book so I can't give you a list of active frequencies. My amateur contacts go in the paper log and the 'oddities' such as 'spy' stations (so called) go in the electronic log.
This information, for what it is worth, is given simply to let you know how I deal with certain things at my station. I have no insider information... what do I know? I am only JAFO.
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