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but devices like splitters and amplifiers for cable frequencies probably won't work with OTA TV.
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Unless the equipment is really, really, old, it will usually be okay for OTA usage. Just look for the frequency specification. OTA requires a pass band of 50 MHz on the low side and 700 MHz on the high side. Most current cable TV splitters are rated for 5-900 MHz or 5-1000 MHz and are perfectly suitable for OTA usage. It would certainly help if you can identify the make and model of the "inline amp" that you have so we can see if it's likely to be okay or not.
I can tell you from the my experience working with customers in your general area that the Seattle area is one miserable set of circumstances for many who want to use an antenna due to the combination of terrain, foliage, and transmitter locations.
The nearby presence of the Kiro translator plus the signals from Bellingham (Orcas Island) will complicate matters. I'd suggest following Flint Ridge's advice and give it a shot. Make sure you have a tree-free signal path towards Seattle, though, otherwise your weak UHF signals won't have much of a chance.