Cisco Systems AIR-ANT1728 Ceiling Omni Antenna, 2.4 GHz w/RP-TNC Lot Of 2. If you have additional questions regarding an item please contact our staff before purchasing. Sigma Surplus is a division of Sigma Equipment LLC. We stock a wide variety of items ranging from small parts to complete machines.Powered by SixBit's eCommerce Solution. The item "Cisco Systems AIR-ANT1728 Ceiling Omni Antenna, 2.4 GHz withRP-TNC Lot Of 2" is in sale since Friday, August 23, 2019. This item is in the category "Computers/Tablets & Networking\Enterprise Networking, Servers\Directional Antennas". The seller is "sigmasurplus" and is located in Evansville, Indiana. This item can be shipped worldwide.