Anterix is a US start-up with the high ambition of building a ‘network of networks’ for utilities and until early last year, seemed to be making good progress in signing up customers. However, progress seems to have stalled, and as pointed out by LightReading, investors are growing restive. “Anterix is testing the limits of investor patience,” wrote financial analysts at B. Riley Securities in a recent client note. The firm’s business model is to leverage its extensive holdings in 900 MHz spectrum to sign long-term leases with utilities and enable private networks to support a wide range of applications. The 900 MHz band supports LTE (or future 5G) and is well-suited to the broad coverage and affordable rural build-outs…