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The radiation pattern is depicted as if you were viewing a vertical antenna from the side. The pattern is actually a circle so the primary lobe goes around, just as the secondary lobes. The primary lobe may take off at an angle or it may radiate on the horizontal plane. The secondary lobes do take off at angles to provide some radiation above and below the primary. The dB figures for the secondary lobes are the amount of difference between their power and that of the main lobe.

The piece of data needed in your quest will be the radiation pattern of the two antennas you are looking at. The primary lobes will be similar but look at the secondary lobes as well. Does one antenna's lobes give better coverage close to the antenna in the areas you need?

Firmware is different than the info in the data file, two different creatures. Firmware controls the radio functions while the DAT file contains how those functions operate. Restoring a DAT file is similar to reloading a program on you computer.

+1

B/ILT (Business, Industrial, Land Transport) licenses are available to any individual whether having a business or not. You need to qualify under Part 90.20 to be issued a license. Certain individuals are also able to obtain a public safety license under part 90.35 as well. The qualifications are much narrower however. (

The rule-of-thumb on power line separation is twice the height of the antenna.

OK

Hmm, I don't have any problem from here.

You'll need to check the FCC registration to see if it has Part 90 approval. l know the D878 is both Part 90 and 97.1

Depends on the band. For all bands, a 6.25 kHz step will handle most uses..

We used to put a nail through an offender's coax.

My comment on the post being uncalled for was over the way it was presented. I agree that SAR and EMA teams need good quality radios however, they do not need "public safety" grade radios in a volunteer organization. Public safety grade units are desirable however they are not required. Commercial grade or quality consumer grade radios are just as effective and have the advantage of being more available. Often, the only technical difference between the radios is the temperature range of the units. An IP67 grade radio is an IP67 grade regardless of who manufactures it as the comparison is to a standard not a brand.

Uncalled for!!!