Almost all fixed wireless operators rely primarily upon Ubiquiti equipment, at least at the consumer end - see www.ubnt.com/products/
Consumer antennas are getting smaller. The standard ones used to be the NanoStation M5 for longer distances (up to 3-4 miles) between the property and the relay/repeater or the NanoStation Loco M5 for shorter distances (up to 2 miles). Both are shallow rectangular boxes. They have a relatively wide beamwidth - both horizontally and vertically - so they don't have to aligned very accurately and can operate well on the margins of the coverage zone.
Some WISPs are switching to the circular NanoBeam M5-16 or M5-19. These have more powerful wirelesses than the equivalently-priced NanoStations but the wireless is more directional so it is necessary to align them correctly.
If you are more than 4-5 miles from an antenna or have a partially obscured line of sight, then the WISP may install an antenna that is akin to a small satellite dish - usually the NanoBeam M5-300 or M5-400. At this range, the distinction between Point-to-Multi-Point (PtMP) equipment used for consumer equipment and Point-to-Point (PtP) used for businesses and dedicated links begins to break down.
Other manufacturers - Mikrotik, Cambium, Mimosa, etc - offer decent equipment but they tend to be more expensive than Ubiquiti and are more likely to be used for PtP links. The market is in flux at the moment because a variety of suppliers are introducing equipment that complies with the 803.11ac wireless standard (the older stuff is all 803.11n) in order to offer faster speeds.
Each supplier has a proprietary implementation of the standard so it is usually not possible to mix and match equipment at the two ends of a link. The base cost of consumer equipment is about £120 (incl VAT) plus installation, so no WISP is going to offer much choice unless you are willing to pay for an upgrade.