The cable for the sub is just a coaxial cable with no ends, so I need to stick an RCA end on, which I've never done. I tried it, but I get some serious hum when I power on the sub, so I'm thinking ...

With its try-hard name and X shape embossed on the front, the RCA Slivr XL antenna ... The antenna has a captive cable that means you may need to buy extension cables to get signal to your TV.