What do you mean by "large trunk"? Do you mean something larger than the residential broadband service from Rogers or Bell (or whatever your local cable & telco are)? If so, the only kind of larger trunk you'd be able to get would be a business-class service and they cost orders of magnitude more than residential services.
Its possible to do, but it won't be cheep. It also depends on where you live. If you live in the middle of no where then you will probably be limited in what you can get even for a backbone. The costs per person would be pretty high for a limited amount of users.
Generally your next step after cable and dsl is SHDSL, T1's and then fibre and this does not come cheep.
Another possibility is short haul microwave. Some ISPs support this. I've heard of some models that will do up to about 4 Gb/s, but the most I've worked with is 50 Mb/s. Depending on the equipment, it's possible to double that by sharing one antenna between two systems by using both horizontal & vertical polarization. Again, depending on equipment (licensed or unlicenced), it's possible to go several kilometers. There a company, in Kanata, called "DragonWave". They have several models that may be suitable.
I don't believe there is anything unlicensed over 5.8Ghz in Canada. I know the US opened up the 24Ghz spectrum, but industry Canada just did a spectrum auction for the 24 and 38Ghz spectrums. Correct me if I am wrong...
Even on some 5.8Ghz stuff you can get up to 300Mbps some companies are claiming now a days with 150Mbps real throughput.
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