You have a clear channel on 2.4 which is kind of unusual. The WRT120 is only capable of 65 Mbps radio speed because it only has one antenna inside (1 x 1 MIMO). This is called a N150 class router. A 2.4 unit with two antennas (2x2 MIMO, N300 class) will give connections up to 130 Mbps radio speed (assuming the client device also has 2 antennas). The actual throughput is less than radio speed because the radio can't transmit 100% of the time. With only a 30 Mb subscription you don't need a high end router but something like a TL-WR841, at about $25, would likely outperform your WRT120 in both coverage and speed.
As for whether to buy or rent your modem that's usually an easy economic decision (to buy) unless you have a lot of lightning storms since the cable company will replace a rented modem if it gets burned out.
As for whether to buy or rent your modem that's usually an easy economic decision (to buy) unless you have a lot of lightning storms since the cable company will replace a rented modem if it gets burned out.
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