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Harbinger is an equity fund with really big plans: the idea is to build a national 4G network of 36,000 base stations using LTE technology, and then lease it to network operators too poor to build their own.

But to do that the company will have to launch a satellite or two and raise some serious cash, but if it can be done then the mobile business will change forever.

The first cost saving comes from those satellites, or at least the frequencies in which they operate. Harbinger has bought into two satellite operators, getting compete ownership of SkyTerra and a decent stake in TerreStar Networks. With SkyTerra, Harbinger has access to 21MHz of national radio spectrum, but not in one place and most of it reserved for satellite use, under existing rules. The plan is to take advantage of a loophole in those rules to run a ground-based service that can compete with the incumbents on a level playing field.

Satellites have dedicated frequencies, but the limited transmission power of the satellite and the opaque nature of most rooftops limits the effective coverage, particularly indoors. For that reason satellite operators are permitted to run base stations on the ground, at the same frequency, to fill in the gaps caused by radio shadows. In the UK we call that the Complementary Ground Component (CGC), and Ofcom intends to bill for its use. In the USA it's know as the Ancillary Terrestrial Component (ATC) and is free to use with the satellite licence.

So imagine for a moment that a satellite operator decides to build a national network of ground components just as a cellular operator does. Further imagine that said operator never gets round to launching any satellites. Now our operator can compete with the incumbent cellular operators without having to spend billions on cellular frequencies.

Such a thing wouldn't be allowed, of course, as the rules covering the spectrum require it to be used to satellite connections, but the FCC has been searching for a way to release that spectrum (as part of the National Broadband Plan), and sure enough last month the FCC approved Harbinger's business plan - relaxing the rules to a considerable degree.

Harbinger will still be required to launch a satellite or two, but it can start building the network first and worry about providing in-fill using satellites later. So Harbinger will be allowed to build a 4G network, and the FCC will even prevent any of the incumbents buying up more than 25 per cent of the capacity to ensure that it remains a wholesale operation.

Those incumbents are obviously up in arms. They valued the spectrum based on obligation to launch satellites - still an expensive business - and the business model for satellite telephones is far from proven. Military contracts and written-off debts keep Iridium in the air, but barely, so the operators had nothing to fear from satellite services unless they come to ground as Harbinger intends.

But ignoring sabre rattling from the incumbents, is Harbinger's plan really rational? Can a newcomer really build out a national network and make money on it?

It certainly won't be easy. The business plan calls for 36,000 base stations, which is a considerable undertaking by anyone's standards, and none of those base stations will be operating in bands already earmarked for LTE use. That means handsets and networking kit will have to be remarkably flexible. Existing networks operate within strict bands, allowing a handset to scan a few bands and locate a compatible operator, but deploying LTE at such unusual frequencies will need an even more flexible approach with the requisite additional development and testing.

Harbinger's budget also doesn't seem to include sufficient running costs for the new network: the if-you-build-it-they-will-come approach. The plan is based on 40 million predicted connections within the next five years, which is a hell of a lot even if one is selling wholesale.

Rumours are that T-Mobile is interested in doing a deal with Harbinger, but as the only operator not building its own 4G network T-Mobile would be remiss not to hold talks even if no agreement is reached. Harbinger also lists "PC manufacturers, national retailers, service providers without wireless capacity, CE manufacturers and mobile providers" as potential customers, and it'll need all of those to achieve 40 million connections.

But beyond the basic incredulity at the audacious scale of the plan are real concerns about the skills and experience that Harbinger can bring to bear. The fund recently drafted in ex-Orange boss Sanjiv Ahuja to run things, which is a good start, but just as you can't build a network overnight, you can't build a network operator overnight. Harbinger will no doubt outsource as much as possible, but the fund will likely find the network operator's club a hard one to join, especially if the existing members don't want to play. ®

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