Rx Tx, sorry, Rx= receive. Tx=transmit. So, the issue is that the same coax is containing both, and its just not as simple as, say a TV antenna that is Rx only. Putting a preamp at the antenna to account for coax loss is a problem, since every few milliseconds, the modem is in Tx mode and preamps don't like a Tx signal pushing up its output. Plus, it won't route to the antenna.
So, try to make the card/modem very close to the window or use a passive antenna a short distance away.
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