Depending on your collectible type Humidity should be less than 60%. Wood antiques should be about 50-55%. If it is mostly paper stuff you are worried about try to get it less than 50% (40-45%) but the lower you go the more uncomfortable it is to be in that environment for you. I think if you can get it no higher than 50% you should be okay for most collectible types. If most of your stuff is in one smaller room and not the whole basement a small room dehumidifier would work
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