There is not a lot of News Copter radio traffic since there is not as much Copter usage as there used to be. I can only recall 2 instances of air to air traffic of any interest on vhf air in my 30+ years of monitoring. News room to Helicopter is a hit or miss.
KARE 450.150 & 450.850
KMSP 450.250, 450.350, 450.450- may have moved to Icom Digital
KSTP 450.550, 166.250
WCCO 450.650, 450.750, 170.150.
KSTP helicopter is from Brainard Helicopters St. Paul Airport Base
KARE, KMSP, WCCO all get there helicopter service through Scotts Helicopters in Le Sueur- often 1 copter provides a pool feed to all three stations.