I'd be interested in your further testing of the Spectrum Force
I did a comparison with my BCD436HP and a few antennas tonight on a distant weather channel. Below are some signal meter readings with different antennas:
Stock antenna = 2 bars
RH77CA = 4 bars
Radio Shack 20-511 Telescopic = 2 bars fully extended. 5 bars if I lowered one top section and one bottom section. It measured 22” long.
Radio Shack 800mhz = 0-1 bar
SpectrumForce = 0-1 bar
I did the same test with a distant 700mhz system
Stock = 0-1 bar
RH77CA = 3 bars
Radio Shack 20-511 Telescopic = Playing with the length, I was able to get to 5 bars. It measured 17” long.
Radio Shack 800mhz = 2 bars
SpectrumForce = 2 bars
If you are primarily interested in VHF or UHF, then you should probably stick with stock, the RS telescoping, or go with the RH77CA. 90% of my listening is 700/800mhz and the RS800 and SpectrumForce do very well and are half the length of the RH77CA. For me, the deal breaker on the SpectrumForce is no BNC. SMA will not work for me as I probably change between the car antenna and my RS 800mhz antenna 10+ times on an average day.
If you listen to any 700-800mhz, at $15 with shipping the SpectrumForce is a great deal compared to the $25 RS 800mhz antenna.
Edit:
After making this post, I looked and Scanner Master has upped their price to $15, so it would be around $22.50 with shipping.