I have bought a Yamaha RX-V450 from Germany and I will no doubt need lots of help setting it up! However my first question is what is a 75-ohm/300-ohm antenna adapter because it only comes with the UK model and therefore was not included. I guess it's something to do with the AM or FM reception. Do I need it and if so any idea where i get it from - Yamaha UK perhaps? Thanks for any advice you can give.