Former KM3 Anchor/Reporter Angela Martin, now in Savannah, Georgia, is listed in MediaLine among those seeking new positions. If her demo tape is to be believed, Martin, who was in Omaha from 2002 until 2004, has improved considerably during her time down south.Any Omaha station would be wise to lure her back here, especially given the scarcity of on-air diversity in the market. Channel 6, which