So whats the best way to sort this mess?

My plan so far is to remove the aerial, sand it all down, rust treat it, and apply filler if need be.
My question comes to the paint, if possible I would like it to look OEM, but like most, i'm on a budget and a professional respray isn't really on the cards.
Whats my options?

My plan so far is to remove the aerial, sand it all down, rust treat it, and apply filler if need be.
My question comes to the paint, if possible I would like it to look OEM, but like most, i'm on a budget and a professional respray isn't really on the cards.
Whats my options?
