Comcast (NASDAQ:CMCSA) announced the launch of its newest Xfinity Wireless Gateway, which the MSO says offers the nation’s fastest wireless speeds with the most coverage throughout the connected home.The new gateway uses the 5.0 GHz radio frequency and also has been built to the MoCA 2.0 spec. According to a competitive analysis conducted by Allion USA, the gateway provided up to 270 Mbps when using the 5.0 GHz channel. It's begun its national rollout and will be made available for the same rental fee as Comcast’s standard equipment.Comcast also has boosted speeds nationwide for its Blast! and Extreme 50 Internet speed plans. Specifically, the Blast! tier increased from 25 Mbps to 50 Mbps downstream and from 4 Mbps to 10 Mbps upstream. Extreme 50 went from 50 Mbps to 105 Mbps downstream and from 15 Mbps to 20 Mbps upstream.