Yup,
Corrugated copper gas pipe is pretty good, the thicker corrugated plastic soft-drink straws will sound out a good rag-horn '3-pitch'.
Good chance that one of the biggest mistakes most new hunters can make is calling to much, or using too much bugle, or trump them with herd-bull aggressiveness. an occasional Little pre-dawn locater, late-late after-noon early evening, if the elk are moving and vocal.
Inclanate weather makes them a little more chatty sometime, but most of the time elk are not real talkative, to much chatter will gives a lot of people away
But much more then a little cow-chirp now and then mid-day if your moving into an area that an answer will give you the heads up, A lot of public land hunts here, elk are on to what people sound like, and it's not the pitch as much as how often.
A hot bull is a hot bull, he is looking for action, but that is more the exception then the rule.
Back before HS changed things around, their 2.5 and a Dirt-Devil vacuum tube attachment, the pointy one with a 45Deg. angle worked good for me. Cutting the ends out of a plastic kids bat will work just as well, wrap it with something like polar-flees to cut down on the plastic-on-brush sound, run a string through it to carry it.
(took a lot of flack for the vacuum tube, but it had tone!)
First cooler day of the summer sends a chill up my spine, I will wonder into the hardware store and pick up one of Wayne Carlton's reids.