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the tomtom one has a sirfstar 3 reciever chipset in which is a better chip to pick up signal than the sirfstar 'all in view' one which is on the 300. so it will have a better reciever strength.
yes you will, all sat nav's will need an external ariel if you cant pick up signal, this is a common fault with them on renaults because of the heated front screen.
i have had a tomtom one and 300 on my clio and sometimes they pick up signal and other times they dont. an external ariel will...