Thanks for all your help. I've been hitting the "books" over the last few days and spending far too much time setting my system up (when I should've be working). I've enjoyed every minute of it! The issues I had with my antenna were "height off the ground", and, after mounting it in the loft, everything started to work great!! (I'll have to get hold of a decent ladder and bolt it to the tv mast on my roof when I get a mo). I've also managed to setup Spectrum lab and Colorgramme. I've tweaked the scrip in Spectrum lab to produce the Colorgramme format log file for a live feed from Spectrum lab to Colorgramme and ftp'd on to the rmob.org website. What a totally fascinating area this is. Many years ago, I used to create and install RFID software and systems which included manufacturing high frequency antennas (in fact, I dug some of old kit out of the garage to make my Yagi) , so this really appeals! - I'm looking forward to many many hours/days/months pouring over books (especially researching chirp sounding) and making up interesting antennae and the like