For almost 15 years I ran Futaba PCM/75mHz FM based radios...and loved the range.
I raced at the old RCThunderdrome events, and they were held on a 1120+ ft. Bicycle VELODROME in downtown Los Angeles and NEVER, NEVER had any inferference.
I switched to the original SPEKTRUM system a couple years ago, and still run on large velodrome tracks and don't have any interference issues...and the range is at least every bit as good. (And it's so nice NOT having to use Frequency Clips on Race day)
R/C Racing since 1985 ~ Santa Maria, CA (Central Coast)
2001-2012 - South-West Tour R/C Oval Series - R.I.P.
...will the SWT be revived? Time will tell, but we ARE returning to the VELODROME in 2016