Will this fit a Vw Bora 52 reg if so will i need any additional equipment?

I have connected arieal altho I had to make adjustments on top my roof to fit the product properly, and the wire's that already came with the arieal were't long enough to reach the stereo so I connected the main wire with original arieal by cutting and connecting and did same with amp wire but I am not getting proper reception not better than i had with my orignal broken arieal.
I don't know what is it hat i have done wrong? The only thing that i think might have missed is that I didn't connect the washer with the arieal bolt? Is the arieal not suppose get earth from the roof or something? Instructions that came with it don't help much so thought you might be able to? What have done wrong to not recieve reception through it?

I have a similar aerial mount in my glovebox of my car and has been there for some time. Could I take it to my local halfords store and ask them to try and fit it for me?

The car don't have an aerial and I want to install one because the radio sounds very bad

My current aerial has been ripped out by vandals. Would this aeriil fit a peugeot 206 - rear mounted aerial? Would Halfords staff be able to fit this for me.?

would i be able to fit this aerial over the hole where the old one was on a peugeot 106, securely with a good signal as i need to remove the old aerial base completely due to it corroding and snapping off of the roof?