I have a window in my office at work but I don't always get a great signal, even on a cloudless day. Is there anything that I can use to boost my signal? The window does not open so putting an antenna outside is not an option. I am using the regular folding antenna that came with it...

Just got an 811 yesteraday and hooked it up to my CM4228. Initially I got all of my stations (ABC, NBC, PBS, WB, Fox) exfept CBS. It came in with a 84 signal strength but would not add it to the list. After letting the 811 find the station 2 more times it finally found my CBS. It does take a...