CM4221HD (New) 4-Bay Bowtie with Balun Hack Modification:
I posted 4nec2 simulation results at fol. webpage (incl. 4nec2 source file):
Measurements were from information posted by <smpowell55> and Balun Hack details
derived from a photo posted by <rabbit73> (see results webpage for thread references).
UHF Raw Gain=12.2-15.3 dBi. UHF SWR(300) under 2.1.
UHF F/B Ratio=19-33 dB and UHF F/R Ratio=15-18 dB.
Hi-VHF Raw Gain=3-6.6 dBi (FORWARD), but HIGHER Hi-VHF Raw Gain=7.7-5.0 dBi
(TOWARDS REAR!). Hi-VHF SWR(300)=EXCESSIVE, esp. on lower Hi-VHF channels.
Although NEW, CM4221HD is still optimized for OLD UHF Band (up thru Ch69),
wasting Max Gain peak on channels that are no longer available for DTV.
UHF Raw Gain is about same as older CM4221 with improved UHF SWR on
lower channels....and Hi-VHF Raw Gain & SWR, such as it is, has been degraded....
Super-Sized-4-Bays have better Gain on New UHF Band (up thru Ch51) and
don't have a Hi-VHF Gain Reversal problem.
More info & charts posted to CM4221HD Balun Hack thread: