Wireless is ALWAYS a gamble, it is up to the installer to determine if it works. When at all possible have a WIRED connection. While Wireless has progressed over the years in leaps and bounds it still has its limitations, it cannot transmit through dense foliage / trees, mountains / hills, metal / concrete etc... The longer answer is: Test it using the intended wireless router and a wireless camera.
Click here for the (CLOS) Clear Line of Sight defined PDF
Our biggest question is.... Would 802.16 be any better than 802.11?
If you have more than 2-3 cameras you NEED 802.16 to get smooth video 802.16 is not better over 802.11 through obstacles, BUT 802.16 will provide stable jitter free wireless video transmission, with 802.16 a/b/g all can go up to 54mbps, n can go to 108mbps. n requires 2 antennas and we can do 802.11 a/b/g/n and 802.16 a/b/g/n in the same radio. The connection speed is a function of the link quality, the link quality is a function of the signal strength.
Obstacles reduce signal strength and also cause reflections which create multiple paths for the same data resulting in collisions. A collision is defined as data from multiple sources at the same time all wireless data is 1's and 0's, so if multiple data sources are received at the same time the data packets are garbled and ignored the AP then broadcasts a request for everyone to resend in 802.11 this is a huge issue when moving a lot of data i.e. more than 2-3 cameras.
In 802.16 the AP manages who send data when so there is not 2 remote radios sending at the same time, like a debate moderator making everyone take turns talking. Our radios can do both 802.11 a/b/g/n and 802.16 a/b/g/n.