I think it would be likely to detune it severely. The ends are high-voltage, zero-current points normally, but with tree branches contacting both ends the antenna will likely be (1) longer electrically, and (2) lossy.
On the other hand, a G5RV is, in general, a rather nebulously tuned antenna anyway. I'd try it. If it tunes, and the trees don't catch fire, it'll likely get out OK. LDGs can tune almost anything.
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-- Carl
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