I'm getting prepared to install a CB radio followed by a 2M soon after. I've been planning a bracket to hold both antennas that will attach to the upper bolts that previously held the tire carrier. I have little experience with the 2M technology and need assistance. How far apart must I keep the CB and the 2M antennas to prevent bleed over? Also, is it best to install springs at the base of the antennas? I don't know if the 2M antennas allow enough flex to prevent damage. Any other tips are always appreciated. Thanks.