Interference from an inverter can be conducted through the power line or radiated through the air to the antenna, or both. Sometimes it is necessary to move the antenna away from the source of interference and run the TV on a separate small sine wave inverter like the Exeltech XP125.
http://exeltech.com/products/inverte...p/125-watt-xp/
http://www.solar-electric.com/xp-125-12.html