For the better part of a decade, Lectrosonics has offered the only off the shelf wireless measurement option with the TM400 and then TM400a kits. With it’s 100mW RF output level, the TM400 kit can cover even the largest stadium measurement jobs.
lectrosonics.com – TM400 kit

Recently Lectrosonics introduced a new plug-on transmitter called an HMa which is a wide band transmitter. In this case, wide band means that unlike the HM plug-on transmitter which is available in any 1 of 9 frequency blocks, the HMa can tune across 3 of those same frequency blocks (side by side).

lectrosonics.com – HMa webpage
lectrosonics.com – HMa spec sheet PDF
lectrosonics.com – HM webpage
lectrosonics.com – HM spec sheet PDF

For those interested in wireless measurement rig using more than one mic at a time, consider the Venue 2 series receiver which can accommodate as many as (6) receiver modules and has a superior radio when compared with the older R400a receiver that comes with the TM400a kit.
lectrosonics.com – Venue 2 spec sheet PDF

Think of the HMa or multiple HMa transmitters going hand in hand with a Venue 2.

If you don’t need wide band frequency selection, a HM or multiple HM transmitters could be used with a Venue 1 receiver.

lectrosonics.com – Venue 1 spec sheet PDF

Or a combination of any of these transmitters and receivers.

Pretty much any current transmitter that Lectrosonics makes can work with any receiver they currently make. The question is whether or not they have the frequency span to tune across each others frequency range.