I really hope someone will be able to help because we have been wrestling with this particular issue (though in other scenarios) for quite some time and no one seems to be able to find a solution for us.
Our business school has face to face seminars with anywhere between 20-70 students at our main campus in Norwich (UK). The seminars consist of guest speakers (former graduates in successful business roles) making a presentation followed by questions.
We want our business school students from our London campus to be able to attend those seminars via an online solution.
We have Collaborate so it seems to make perfect sense to use it for this purpose.
We need a wireless 2 channel mic solution - a handheld roving mic for questions and a lapel/headset mic for speakers going into a wireless receiver connected to the audio socket in the computer.
The business school students will be logging in from indidvual computers so we don't need to worry about providing a venue and audio in London.
Ideally we would also want a video camera that can act as a web cam also.
We have purchased a solution (KAM dual VHF Wireless Mic system - http://www.normans.co.uk/p-2644-kam-kwm1932-dual-uhf-wireless-mic-system.aspx and the kit works fine in other contexts. It works in Collaborate but not well - bad quality, tin-y, fishbowly sound.
Does anyone do this stuff and can you recommend kit to purchase?