Felix wrote:

Comparison: RoomCap with EH-Antenna

The EH-antenna is offered as a compact, efficient short antenna.
The user reports about this antenna are very varying, from
enthusiastic
to unusable.
Therefore, I was interested since long time to perform a comparison
test
of the RoomCap with this antenna.

Now, an additional comparison was made,
now between RoomCap and Magloop antenna.

Since long time it was my desire to compare the RoomCap antenna with a
good
magnetic Loop antenna.
On November 30th 2006 this test took place.
The test was assisted by Edy, HB9EBG.

Comparing antenna = Magnetic Loop, 85cm diameter, 35 mm diameter of
tube, copper tube, silvered, with Annecke butterfly capacitor with
remote tuning, in vertical position.

Test antenna = RoomCap for 20m, 5cm diameter, length of radiator =
150cm, without top capacity.

Both antennas were placed at the same height (150 cm above ground) in a
free field,
using the same 100 W transceiver, and adjusted to VSWR 1:1.

In total, 13 comparing QSOs were conducted in the time between 13.30h
to 16.00h.
In each QSO the antenna was quickly changed many times and the remote
station
was asked to indicate the average signal strength difference between
the two antennas.

In all contacts the RoomCap was reported clearly as the stronger
antenna, where the
smallest reported difference was 1 S point and the largest difference
was 5 S points.

Here follows the list of the reporting stations with the indicated
difference in S points.

YO5PDW + 1
LY3ZM + 3
RU6AH + 1
UA3AIU + 1,5
YO3AJN + 2
EA8BRW + 2
LY2SP + 4
UR0EA + 2
YO4AAC + 1
UT8NF + 1
YO6KSU + 2
UR5HDE + 5
SV0XBA + 2

This corresponds to an average difference of 2.11 S points.
An S point is defined as 6 db, resulting in about 12 db advantage.
(It is clear, that the receivers many times do not follow exactly
this definition, but in the average this may be close enough.)
In other words:
The RoomCap radiates about 15 times stronger than the Magloop.
(15 times the power).

Felix HB9ABX