We are not; for multiple reasons, but most particularly:
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A 40" long signal stick would not be able to hold itself erect even when stationary — much less if you moved around with it.
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We don’t currently have a good way to make the matching section at the base (or middle) which would be needed to make a 1/2 wave antenna viable.
We are experimenting with some designs which would have improved performance in the 70cm band at a similar length, but would have lower power limits. There are a lot of challenges, so we’ll see how it goes!