I may be misreading your post, EvilBivol-1. If so, please accept my humble apologies in advance.
NDBs transmit in all directions, hence the nomenclature "non-directional beacons", and are used in radio navigation. NDBs are very different beings than the inner, middle, and outer markers that are placed along runway approaches for use in making landing approaches using instruments instead of visual cues. Markers are radio beacons, to be sure, but they transmit directly up (a cone of only about 45deg from straight up, I think) and are very low powered (3 W). The lowest power NDBs are around 50W but can get up to 2,000+ W. I don't have statistics, but I'd assume 1,000W is pretty standard power for an NDB.
An ILS system (including the OMI markers) may be brought down, due to maintenance or faults, but the marker beacons are not switched off and on depending on which way the wind is going. Every marker transmits at the same carrier freq (75 MHz), with the outer, middle, and inner markers modulated with a specific tone for their position (e.g., there's a characteristic tone for outer markers that's distinguishable from the inner and middle marker tones),but they can't conflict with each other since they only transmit straight up!
Some confusion may arise from the fact that NDBs are SOMETIMES co-located with a marker, but they are still two separate transmitters with two separate purposes. The just happen to be roommates.
Every marker beacons transmit on a carrier frequency of 75 MHz while each NDB has a unique frequency between 190 kHz to 535 kHz. NDBs are placed and freqs are assigned so that there are no conflicts between them - although mistakes CAN happen, this would be a big mistake, and I sincerely doubt that the FAA would tolerate overlapping NDBs for long.
I've assumed NDBs and markers are modeled as separate thingies in Black Shark (haven't experimented with radio nav yet - still working on hovering without crashing!) but this post makes me wonder if there hasn't been some confusion between markers and NDBs... will have to check now.