The only, or biggest concern with coax length is, will it reach between radio and antenna conveniently? Especially with VHF/UHF stuff, you want as little loss as possible, but there are rea$onable limit$ to that. With the height you're talking about, figure something like for a 100 feet of feed line for that loss factor. It'll be less than that, but it makes for easy figuring. Until that loss gets close to 3 dB, it's just not worth wasting any worry on. (Of course, if you just happen to have some 4" nitrogen filled hardline laying around, use it!)
In other words, no, it doesn't matter.
- 'Doc