If you look at the competitors in the prospectus, looks like...

If you look at the competitors in the prospectus, looks like theres a fair few wireless ISPs on the asx, all operating outside the NBN.
Prospectus lists Acenet AirStream, Adam Internet (ASX:TPG), Beam Internet (ASX:SWP), BigAir (ASX:SLC), BITS wireless, Bitwave Networks, Clear Networks, Countrytell, Dreamtilt, Dcsi, Exetel, Goyder, Gtelecom, iiNet WiMax (ASX:TPG), Lightning Broadband, March IT, Next Gen Wireless, Node1 (ASX:SWP), NuSkope (ASX:SLC), Ooki, OpenCloud, Red Broadband, South Western Wireless, Speedweb, Splash Internet, The Signal Co, Vivid Wireless (ASX:SGT), Wi Sky, Wires Broadband, Uniti Wireless (ASX:UWL), Yourhub.

SLC - market cap $400m, mixture of NBN reselling and enterprise and some fixed wireless assets, recently bought Exetel for $110m, 185,000 customers, national footprint, $34m ebitda (trading 11.76x ebitda multiple)

UWL - market cap $2.2bn, originally started as fixed wireless in Melbourne and Adelaide, now a portfolio of fixed fibre ports assets and phone number services, national footprint, 121,000 active customers, capacity of 438,000 customers, $87m ebitda FY21F (trading 25x ebitda multiple)

ST1 - market cap $200m, fixed wireless in regional Victoria plus bunch of enterprise telcom assets, 11,000 business customers, national footprint, forward ebitda FY22 $20m, trading om 10x forward ebitda.

SWP - market cap $190m, national fixed wireless, 25,000 customers, ebitda $4.5m , trading on z42x ebitda multiple.

TPG - $11.5bn, portfolio of tier 1 mobile and internet assets Vodafone, iiNet.

SGT - Singtel market cap $36bn, owns Optus.

5GG - market cap $180m, fixed wireless only in WA, 6,000 NBN customers, 4,000 fixed wireless customers, losses of $11m in six months to Dec 2020, cashflow negative. Ebitda forecast to be negative for next three years.