upgrade from d-link dcm 202

[IRONBATMAN]

Hi,

I currently connect my Coaxial wire to this
http://www.newegg.com/Product/Product.aspx?Item=N82E16825112104

and it connects to my router. But I was thinking of upgrading it. Does it improve the connection strength ? Does it improve anything at all ?

Thanks

 

[IRONBATMAN]

Is there a modem that I can upgrade to that supports speeds of 300mb/s ?