yes if you're only connecting at 54mbps then go no cost option.
installing anything with 2x2 aerials or above is just for moving around data at much higher speeds. 54mbps will give real world 3-4megabytes/s throughput - whereas a 2x2 antenna wifi card operating in the 5ghz range can give 10-11megabytes/s throughput (router allowing).
installing anything with 2x2 aerials or above is just for moving around data at much higher speeds. 54mbps will give real world 3-4megabytes/s throughput - whereas a 2x2 antenna wifi card operating in the 5ghz range can give 10-11megabytes/s throughput (router allowing).