I have a portable DVD player with built in analogue TV tuner. (Orbit PTDVD 768S). The unit is pretty good for the money but the TV picture could be better when using the telescopic aerial (it's fine with a external aerial plugged in). The telescopic aerial is quite short at only about 18 inches (45 cms) fully extended. I could quite easily remove it and screw in a longer aerial from Maplins. My question is... Is there an optimum length for a telescopic aerial for UHF TV reception? Or is it simply a case of longer is better. I could plug in a set-top indoor aerial but that means having to carry around another item.