Fitting the roof aerial isn't too hard. You just need to drill a hole in the roof and thread the cable to your radio, remove the wing aerial and fit an aerial blank (easy found on ebay). I have done mine as my wing aerial seized and it didn't look pretty. regarding your clutch does your car have a hydraulic clutch or good old fashioned cable, If it's cable your clutch cable needs renewing first and if no better it is clutch time but if hydraulic and it's making a noise I would check if it's losing fluid before condeming it.