All this talk of range problems, Antenna's and Mods etc really only confirms that I made the right choice with the R1a's.
For Timecode I use Tentacle Boxes.
My IFB Kit works hard and often and I am very happy to say that I never have range issues, failures or complaints. Yes the entry price is high and yes the battery life is not as good as Comtek, but you normally get what you pay for and if you change batteries at lunch time you will be fine.
One thing to note is that choice of headphones is important as the R1a's prefer higher impedance for optimum sound. I use the Williams Sound HED 021's which are 32 Ohms.
My IFB Kit consists of:
1x Lectrosonics UM400a Transmitter
3x Input Leads
14x Lectrosonics R1a Receivers
14x Williams Sound HED 021 Headphones
This all fits into 1x 1520 Pelican Case with TrekPak Insert.