And, get there EARLY!
You have no idea what problems you'll find, until you get there.
I'm assuming you are going to show off some TV sets or something, using Cable TV. A good choice for an amp, is the Scientific-Atlanta or Motorola (they are the same inside) 4-way Drop Amplifier, like this:http://www.scientificatlanta.com/cus...ce/7000240.pdf
It will give you a little bit of gain to each output (+7 dB each, on a 4x). You might find something like it (Motorola-branded) at Best Buy or Circuit City, or ask the Cable company ahead of time. But, like I said, check things out early. Most hotels and Convention Centers have lots of problems.
Why not use an OTA signal, though (at least on one set), to show the good stuff?
Remember.....OTA is always
ATSC/8VSB (and, all new sets must be able to receive it, if they have any tuners at all), and Cable is almost always QAM (which requires a QAM-capable set to get anything at all, and requires a CableCard or the Cable company's rented box to get anything other than the few local stations' HD channels....which are usually
unencrypted. Most other Digital Cable channels, and all other Cable HD channels, are usually encrypted, and need their box or CC).