  The Arecibo HI Strip Survey probed the halos of ~300 cataloged galaxies and
the environments of ~14 groups with sensitivity to neutral hydrogen masses >
10^7 M_sun. The survey detected no objects with properties resembling the High
Velocity Clouds (HVCs) associated with the Milky Way or Local Group. If the
HVCs were typically M_HI=10^{7.5} M_sun objects distributed throughout groups
and galaxy halos at distances of 1 Mpc, the survey should have made ~70 HVC
detections in groups and ~250 detections around galaxies. The null detection
implies that HVCs are deployed at typical distances of <200 kpc from the
galaxies or group barycenters. If the clouds are in virial equilibrium, their
average dark matter fraction must be 98% or higher.
