I used to think I had my finger on the pulse when it came to tech stuff, however I am at a loss when it comes to setting up my new 47" bedroom tv with a decent signal and channel changing options. I have coax at present but the quality is not what I want. Do I go HDMI, if so how do I change channel? The cable would probably need to be circa 20-25mtrs Are there any wireless options such as wifi, I just need some direction on what will give me decent quality please help!!