by Telephony Online with two Telephony Innovation Awards "Most Innovative Broadband Wireless Service" and "Most Innovative Small Business Service". In November 2009, Towerstream expanded service in Philadelphia and in April 2010 purchased Sparkplug's business assets in Chicago and Nashville, increasing Chicago's customer base to be Towerstream's third largest coverage area. In December 2010, the company expanded its presence in the Boston and Providence markets when it acquired business assets of Sparkplug Communications. In 2011, Towerstream entered the Las Vegas/Reno market with its acquisition of all of the One Velocity's customer contracts, network infrastructure, and related assets in those cities. On July 13, 2011, Towerstream representatives visited the NASDAQ MarketSite in New York City's Times Square, where the CEO rang the closing bell. In January 2013, HetNets Tower Corporation was formed as a wholly owned susididary of Towerstream Corporation. HetNets closed its operations on March 15, 2016. In November 2015, Nasdaq and the SEC warned TWER of a risk of delisting for its closing price staying under $1.00 for 30 days. In November 2016, TWER delisted from Nasdaq and moved to the OTCQB over-the-counter market. Technology Towerstream markets a combination of Fixed Wireless and WiMAX (802.16e) technology as "4G". Fixed wireless networks use Ethernet technology, not TDM that the legacy infrastructure relies on and have been in production since the 1970s, primarily used for backhaul in voice networks for phone companies. The network uses Radio Frequency (RF) base stations to provide Internet access. Towerstream base stations connect to multiple Tier 1 network IP backbone service providers, to ensure continuous service should any of the fiber providers go down. Towerstream's markets operating with WiMAX technology use the 3.65 GHz spectrum band and are true Non-Line-of-Site (NLOS). Its markets using Fixed WiMAX service run over the 5.8 GHz spectrum band and are Line-of-Site (LOS). In 2014, Towerstream launched its On-Net fixed wireless service offering building owners and property managers a redundant and reliable dense urban network that directly connects with Towerstream's fiber backbone. Towerstream On-Net building tenants have access to 100 Mbit/s of dedicated, symmetrical Internet connectivity, with a premier SLA. These On-Net buildings leverage Towerstream's fixed wireless network built high above each city. The dense, mesh architecture is highly redundant and reliable with short-distance connections to Towerstream's fiber backbone in each city. Towerstream installs the equipment required in each building to provide every business at that location with 100 Mbit/s connections. HetNets