Cheers Mark and welcome to the forum. The antenna that comes with the RB gives good reception. Try it out in various places, the higher placed the better. If placing on a window ledge, it will probably work better if placed on the outside ledge as double glazing can sometimes cause problems. It's advisable to bring back inside if it is raining (which it usuually is here in the west of Scotland).
Be sure to contact the forum if you have any queries or need help with anything as there are plenty of us who can assist.
Cheers,
Ian