The environment's properties matter the most here.
Your restrictions seem infeasible in an environment that's open, expansive, and open to the invasion of predators or threats. Communication is how a species survives. You coordinate the retrieval of resources, you communicate the presence of a predator/threat, etc. In an open area, your species here can't easily transfer knowledge to one another. If a predator invades, unless their intelligence has allowed for countermeasures then they are screwed.
Thinking about it, a colonial species society would be best, within the confines of close quarters habitat where the habitat itself is built in a way that maximises the communication between members of the species, without extra variables or possibility of interference.
Consider the following:
You have an intelligent species that lives in something like an ant-hill or beehive made from materials that transfer and resonate the communication method throughout the colony. You then don't have to explicitly rely on communication through the air and it provides incentive to take up roots and build such infrastructure for themselves.
How feasible this is for your species depends on the logistics and precise technology of your method of communication as well as their biology. Perhaps they need to find copious amounts of copper or aluminum. Perhaps they need to ingest food and build the colony from their vomit. Other variables include how sensitive they are to these vibrations. What that is like is up to you, but at the end of the day, the environment is their saviour or their downfall.
Nature tends to favour social animals that can help each other. Without that, they will be wiped out by the rest of life on the planet and the planet itself.