I have the antenna in the subject line; my first helical antenna, looking forward to working some birds with it. My antenna system consists of this antenna for UHF & a WiMo 18111 10 element cross pole Yagi for 2m.

Questions: is there any harm in routing the coax along the antenna boom through the helix to the cross boom? 

Same question for the 2m antenna..coax along the boom OK?

Reason I ask: I've seen several photos of feed lines coming off the rear of the booms to a feedline support that is fixed perpendicular to the cross boom...maybe there's some significance to this? The latter seems like extra work; fine if the results are worth the effort, but...?