This is a Maspro UHF booster, model UB40. I was using the same booster, but reception became poor. I thought the indoor unit was faulty, so I purchased this unused item on Mercari. I replaced the indoor unit and observed it for a week, but there was no improvement. I concluded that the antenna itself, the wiring, or the outdoor unit was faulty. I removed the antenna and installed a design antenna, so I no longer need this item and am listing it for sale.