Bandwidth / Cisco Aironet 1200 / 24 Classroom Dell Clients

100Mbps switched Ethernet network
Cisco Aironet 1200 AP
24 Dell Latitude D600 laptops in a classroom with:
Dell TrueMobile 1300 WLAN Mini-PCI Cards

We are setting up a classroom with the above equipment. There are no
obstructions in the classroom. The students will not be doing heavy
downloads; just typical Internet browsing, accessing files on our Intranet,
etc. The students will often be pressing Enter at ~ the same time, following
instructions from their instructor.

Q1. Should one AP be enough for this load? Or would it be a good idea to use
a second AP and split up the clients half-and-half?

Q2. We have the optional ceiling-mount antenna, but we have not installed it
yet. Will this be necessary, or can we just use the ordinary AP antenna? It
is an ordinary square classroom, ~ 20'x20'.

I am familiar with network admin stuff, but this is my first wireless
project.

Thanks for any info.

-- Jay